Who use C-x u or C-/ for undo? Who uses C-z for undo?

[Jean Louis]

* Dmitry Gutov <dgutov@yandex.ru> [2021-02-15 05:24]:
> On 15.02.2021 02:39, Emanuel Berg via Users list for the GNU Emacs text
> editor wrote:
> > > Because even though "suspend job" is handy to have in the
> > > toolset, if an average user only reaches for it twice a year,
> > > that command doesn't really need a key binding as prominent as
> > > 'C-z'.
> > Well, yes, but C-z isn't a good key. You have to move your
> > entire hand, and it is awkward (keys too close) at that.
> > 
> > > In comparison, I hit 'undo' at least a dozen times per hour.
> > I have `undo' M-0. Left thumb, right ring finger. Much better
> > IMO.
> 
> M-0 is not too bad, but I think we can agree that 99/100 new users will look
> for 'undo' on 'C-z'.

Personally I have never used C-z for undo in Emacs. I do use it in browser as 
that is the only option.

I have been using undo with C-x u for long time and still do so on many 
keyboards that are not this US type of a keyboard. On this US type I use C-/ 

Emacs was terminal application in first place, so at that time there was no 
Control-Z as undo I believe, it was meant probably for something else (guess 
what). 

More references for your research:
https://en.wikipedia.org/wiki/Substitute_character#Other_uses

Also take in consideration that Xerox is US company and they used QWERTY, as US 
company did not think of international planning. I do not agree that Control-Z 
is internationally good key for undo as sometimes it is close to left hand, 
sometimes it is in the middle of keyboard on QWERTZ layouts: 
https://en.wikipedia.org/wiki/QWERTZ

For you is easy to access Control-Z but when I am in Germany or simply use such 
layout, and I do, my mind switches and my Z is in the middle of keyboard. Not 
any more easy to access with one hand. Control-Z becomes little pain with left 
hand and is easier to access with both hands on QWERTZ keyboards.