Well, they're not wrong because every other CAD tool simply rearranged the UI for no reason.
In addition, the problem with semiconductor CAD tools is that any feature which isn't used by everybody is effectively broken because it has zero users, to an engineering approximation. I wish my CAD tools had a "CAUTION: this feature was used N times in the last 180 days by all users of the tool where N < 10. Expect bugs".
Although, in terms of UX I've never understood why CAD tools don't use Pie menus--games adopted them eons ago. (Fusion 360 is the exception, and it's a wonderful breath of fresh air).
I'm really curious where you worked now, as I don't remember any of my VLSI CAD tools getting an effective UI makeover (and we used a lot of them). Although I'm pretty sure we skipped most Mentor tools.