@Stefan Schippers one question related to the symbols of the sky130 standard cells you have developed for SKY130. We are about to develop something similar for IHP stdcells however we have doubts if actually it will be useful for the community because of the fact that for digital all folks use verilog and digital flow. Maybe from the educational point of view it is justified. The same applies for small mixed signal design. Anybody who has an opinion is more than welcome to share it.

Exactly. The full set of standard cells is probably never used in a schematic. Some mixed designs might require some logic gates / latches / flops in the schematic, may be a minimal set for that could be enough.

thank you for your opinion, the question is always "how much is enough?"

Fully agree: There is always a need for some simple logic, even in analog cells that have minimal digital control. All the basic logic gates, plus a handful of latches/FFs, plus the extras like tie-0/1, etc, would be a good start.