Currently the site collection URLs are fixed as https://tenant.sharepoint.com and cannot be changed. This does not fit with flexible cloud-based solutions - business needs will inevitably result in an organisation changing it's name during its lifetime (mergers, acquisitions, rebranding etc). While it may not be possible to change it so that entirely custom domains are used (eg contoso.com, instead of sharepoint.com), it must be possible to allow the sub-domain to be changed (eg. newtenant.sharepoint.com)? Please?

Migrating an entire organisation (likely to include Exchange, Skype, Sharepoint and Onedrive data!!) to a new Tenancy is absolutely not a viable option.

Please change how SharePoint generates links to uploaded documents and site pages, so that URLs with spaces will replace %20 with a dash instead. Most CMS tools including blogs do when generating SEO friendly URLs. Links with %20 throughout are too difficult to read.

This feedback site is a perfect example:

This:
https://sharepoint.uservoice.com/forums/282887-customer-feedback-for-sharepoint-server

is easier to read than this:
https://sharepoint.uservoice.com/forums/282887%20customer%20feedback%20for%20sharepoint%20server

This is essential and needs to be easy to find instead of hacking the URL every time you need to sign in as a different user.

In case I get access SharePoint Online along with the URL which is not encoded through Internet Explorer, I am aware that the HTTP 500 internal error occurs when clicking the App launcher's［Email］［Calendar］in the sate that the URL includes the double-byte characters(such as Home). I hope the immediate improvement concerning this incident.

Content types are an essential part of SharePoint. One issue that has been around since SharePoint 2007 is the absence of an overview of all applied content types. Why is this important? Try to delete a content type and you get the message it's still in use. Good luck finding out where. This is very frustrating and time consuming. That's why I vote for an overview where you can see where the content types are applied.

Allow the owners of the sites to view a report of the security of their site. Start by adding a chart of the inheritance breaks of the whole site in one glance. This will become more and more important since you can use the 'Share' button on a file and break inheritance without understanding what you're doing.

Provide a setting to control the maximum allowed file upload size. This enables Organizations to controll their limited storage better. The new 10 GB upload per file Limit enables user to quickly drain all available Tenant Storage

Need Powershell/CSOM or Admin UI ability to backup and restore entire Site Collections in order to create a new (duplicate) site collection in the same tenant.

We typically discourage site owners from sharing at the document level due to the increase in administrative work that it causes. We also discourage owners from inviting individuals - we suggest that inviting groups makes the work simpler. However, the interface when sharing a document doesn't encourage sharing with groups - doesn't even make it obvious that sharing with groups is possible there. Are we wrong in how we are encouraging our site owners to manage their sites? If not, can it be made more obvious that sharing with groups is the best practice?

The new layout looks better, but there does not seem to be any way of re-ordering these - not even alphabetically. When you follow a lot of sites as I do, they can be hard to find in an unordered jumble of large tiles.
Please either sort automatically or provide a means for us to sort them!

https://support.office.com/en-us/article/Turn-scripting-capabilities-on-or-off-1F2C515F-5D7E-448A-9FD7-835DA935584F?ui=en-US&rs=en-US&ad=US

From this article, using the following powershell command we can Turn scripting capabilities on for specified site.
Set-SPOsite <SiteURL> -DenyAddAndCustomizePages 0

It doesn't work for group site and onedrive for business site. We can set Custom Script value to Allow users to run custom script on personal sites in SharePoint admin. All onedrive for business site will turn on it after 24 hours.

But how to turn on for group site?

It would be great if a site or site collection could be restricted to an IP address range instead of at the SPOTenant level

How about having Self Service Site Creation for Host Named Site Collections? Vesa has given us a Site Collection provisioning app but it would be great to have this out of the box.

give options / settings to modify basic look and feel on https://annu28.sharepoint.com/_layouts/15/sharepoint.aspx. user should be able to choose which Team sites tiles should display on this page.

Current methods of exporting and importing are extremely clunky and prone to break functionality. A built-in, fully supported method would be appreciated.