Sure, Artifactory, etc. have their places. But I am objecting to your "no true scotsman"[1] type of argument. Furthermore, the most bizarre setups I have seen have been in "serious" enterprises. Hardly an endorsement.
I have to agree with the poster you are replying to. If an entity is not doing the bare minimum to QA software supply chain, then they are not "serious". That being said, I have seen many a large enterprise that do not treat software development as a serious endeavor and it shows.
1: https://en.wikipedia.org/wiki/No_true_Scotsman