I read this post a while back and had forgotten all about it, but recently I have been having issues with Firefox and corrupted cookies so I was looking for an alternative browser, one that is capable of synchronisation across multi-platform devices.
The first one I tried was Opera and that was soon consigned to the Trash!!
I loaded Edge onto my wife's PC, my iMac, two iPhones and an iPad and it couldn't have been more straightforward.
Using my iMac first it seemed a little slower at loading than Firefox but once I had sorted out all the crud that came with it, and set it up the way I like it, I found it just as fast, if not faster. One of the first things I turned off was the 'Content' that loaded at the bottom of a new tab.
Importing all the Bookmarks etc from Firefox worked very well indeed and synchronisation between devices is fine.
There don't seem to be any real problems apart from, maybe, the inability to customise Edge with different Themes other than Dark or Light but, on the whole, a good browser which I shall be keeping as my default for the time being.