there is much more to good undo than this.

many editors collapse edits into a groups and you can only undo by groups, not individual keypresses. This is usually desirable. For example type X then cursor right 60 times then type Y then undo 3 times. Are you at 2 characters before where the Y was or back at the X or before the X? In other words, were the 60 cursor right keypresses collapsed into 1, 2 steps or not collapsed at all

Good editors spend some time thinking about the most expected group definitions, bad editors (vscode in this specific case) seem to have picked a random number for their group size or a even a fixed number of keypresses but it feels random. There's no predicting how much it's going to undo in a single Ctrl/Cmd-z. Ii rarely does what I want compared to other editors