+1 for tabs everywhere. I never used webfig because of this, it's unusable unless you work on a 9:21 monitor.
+1 tabs everywhere!
In v3 you can switch between tabs using ctrl + tab, which made glancing at each tab very fast.
Also they were logically separated (for the most part) to tabs that made sense.
i.e: In firewall you had the general options (which 99% of the time you use), then more advanced options, then extra options, then the action which was the second most used tab, and then traffic. It all made sense and you could find what you needed in a glance.
Now you have to scroll, click/expand, search for stuff. And while in the field with small screen laptops, it kills the workflow.
Having a giant list of options is mentally taxing when trying to find stuff. Especially when everything is grey and you can distinguish anything.
Also on Windows 10 x64, when having multiple windows with lots of data (eg large routing table, lots of firewall rules, etc), when winbox refreshes the data every 1-2 seconds, everything freezes.
How to replicate: Open Interfaces window, preferable with many interfaces (in my case 40 interfaces), leave it open, now open IP > Routes, (you must have enough routes - in my case ~1900 routes), now try to move any window (or do anything else for that matter) and winbox freezes every 1-2 seconds. The easiest way to see the freeze in action, just grab a window and keep moving it around and around and it will keep freezing every 1-2 seconds.