That’s a huge liability/red flag.
Builds should be deterministic, and reproducible. An IDE should have no say in that, that’s what build tools are for. That’s just all around terrible. Also, a sane IDE should be able to make use of the config files of the build tool.
I mean, if you say so. Said project has been around for 25+ years, survived a dozen acquisitions, is actively developed by 1000s of developers all over the globe, and has revenues in the $100s of millions. So clearly they are doing something right.
Personally, I loved never fucking around with IDEs.