Hi. Sorry for the late reply.
For the python/pip3 part: Would be good yes.
For the venv: I'd suggest to rather put a note somewhere that using venv might be beneficial. But since the acutal setup of a system is up to the user, I would not rewrite the wiki to use a venv by default.
Would you maybe like to do these changes?

Update: Please don't use sudo in the examples either (see #1558 ) ;)

Oh okay

Using sudo for apt though is necessary. The discussion you linked was about pip where it indeed should be avoided to use sudo and most of the time --user should be used.

oh yes, overlooked that. just saw sudo and remembered #1558 :D Thanks for being busy on the wiki! Feel free to close this one you're done :)

Additionally i added a few ```python tags to doc strings and used python3 -m pip instead of pip as the former has a few advantages and is recommended. Maybe we should also add this issue to the 13.0 Milestone as there are a few places in the wiki where we include additional information for python 2 which we won't support in that release (otherwise feel free to close this or create a new one tracking the removal of python2 specific sections in the wiki)

Mh, I feel like that can be removed when someone stumbles upon it after 13.0 is released. I'll close this for now.
thanks again for the effort :)

Seems we rushed ahead a bit here. The consensus is the dev chat is that people should know what python version they use. I reverted the changes.