I said neither 'art' nor 'paintings' which you have fixated on for some reason. I mentioned creative endeavours that are generally team-based but all generate some sort of portfolio. Whether that portfolio is from work or done in one's personal time, it is still a portfolio of past work.

Plus, software engineering is absolutely a creative endeavour. And I daresay normal 'engineering' (civil, mechanical, aero, etc) is a creative endeavour too; it's just a matter of egos and that seem to separate STEM versus non-STEM. There are portfolios for everything. I don't understand the desire for software engineers to just waltz into an interview, claim to have done X, Y, Z, with no proof, and secure a job.

The proof part is interesting. Civil is easy to prove because of its artifacts. Someone from Netflix or Meta layoffs, what proof do any of them have? Do some people defensively maintain background proof other than paycheck stubs?