Most orgs would do well with basic UIs. As someone who has done help desk, users are fucking stupid more times than not. Microsoft is constantly changing their UI just because they feel like it and we’d get tickets because “Microsoft updated and I can’t find X anymore!”.
Yeah, it’ll take some getting used to for some users at first, but the lack of constant, arbitrary UI updates will help over time.
It looks outdated but that’s what most businesses deal with specifically because of dumb users and because businesses don’t want to pay to keep training users on new UIs or paying for support to educate users and a lot of it is gimmicky, not really providing anything new but just a different way of looking at the same screen.