Moving somewhat further off-topic, as a fan of vertical taskbars I also disliked Unity's take on it. In my own testing (going way back to Windows XP era), I found I much preferred right-hand side taskbar. As a left-to-right language user, when applications are full screened there are usually far more important application controls on the left hand side than the right. The obvious one being File menus on the immediate left edge, but that's not the only example. Unity tried to fix the File menu issue by doing the "merged global menu" thing similar to macOS, but it still didn't account for most of the rest of application stuff on the left hand edge.

But I also realizes that not everyone agrees with my "right-hand" taskbar preference. I agree that allowing customization is probably the best bet. It's odd to me that when one of the messages in the Windows 11 announcement was that they wanted it to be more personalizable that according to their notes they are removing an important personalization in taskbar placement. (Which has been supported to varying degrees of success all the way back to Windows 95 at this point.)