A laptop first and foremost usability parameter is to be portable also as a workstation. The thicker and heavier it is the less it will move form your desk and defies the first goal of a laptop. Sure, there are other usability parameters but if you are considering ergonomic solution such as noise look elsewhere - ie desktops. All laptops perform worse than desktop on all usability parameters except portability. Finding the balance between portability and secondary usability parameter is difficult and a matter of opinion.You've set it up as Apple not paying as much attention to detail with Ive's departure, but there are two key kinds of attention to detail. And Ive gave great attention to design detail, but poor attention to engineering detail. There has to be a balance, and IMO the pendulum swung too far to form over function during the Ive era.
Further, engineering detail should not be dismissed merely as a list of specs. It includes usability. Take the butterfly keyboard, for instance. [And let's set aside the reliability problems.] Here we have great attention to design detail, because it enabled a slimmer, more beautiful machine. But we have poor attention to usability detail, since the lack of travel made (for most users) a less comfortable typing experience, especially after many hours at the keyboard. And it was noticeably noisier, another fine but important detail Ive missed.
Another key usability detail is fan noise. You can get used to a machine not being as svelte as you'd like much more easily than to it being noisy. It looks like Apple paid better attention to the this key usability detail with this machine, by combining processors that generate less heat with a case that can dissipate more of it, which will make for a much quieter (and more performant) user experience.
Fully agree that Ives vision took the MBP (and MP 2013) too far in Intel/AMD era and in reality he was designing for ASi. The M1 pro and Max would work well in a slimmer package. That the poor durability of the butterfly keyboard was not caught in QC is an enigma. Who did decide to let the butterfly keyboard pass? Any evidence it was Ive alone?