When they stop working at the site when they make the blueprints -- or worse, only look at them, you should run, or at least make sure they're only involved in management, and not any important technical decision making.
They are not going to do a good job.
Software engineers used to mock non-coding architects for good reason.
Again, it sounds like you are against vibe coding ("stop working at the site") and so am I. There's a middle ground worth acknowledging: we've built an automatic wire pulling machine and there's no reason to hand-pull anymore unless it's a really weird bend. If you just load up the machine with a spool and come back in 24 hours, though, it'll make a mess of wire all over the place.