I don't think Apple ever makes any moves without involving both design and function. I'm using a MB 12" and still love it, minus the butterfly keyboard issues. I think the whole butterfly keyboard thing caused an enormous rift btw Cook and Sir Ives; the Air and the 12" MacBook were aggressive moves in terms of weight and engineering design. The new Magic Keyboard has resolved butterflygate and moving forward here; the goal is to sell more devices without class action lawsuit problems. Apple does not have time nor afford (not financially) to mess with such trivial matters; thus I think a decision was made to keep the design simpler and just simply produce very solid products for the time being. We will get back to a more sleeker awesome design era but when your target is to sell 250M+ iPhones a year, you've got to pick your battles and keep some things very simple. The aggressive design nature wasn't worth the problems; let's just keep the designs reliable and durable as nobody is going to not upgrade because the design isn't better or not. Right now, it's a matter of reorganising manufacturing plants and locations in Asia. These new MBP's and MBA's are super solid laptops, and now I think it will be a challenge to meet market demand as I think the Mac Sales will grow into becoming a serious fourth leg of the revenue stool....this will grow quickly in the next 24 months into ~$20B/quarter Mac sales revenue.
I'm dying for an upgrade to my six year old MB 12", but there has been so much transition in the Mac line from the keyboard to the switch from Intel to now moving to a 3nm chip manufacturing process. We're really just getting started and there are tons of more things to come to WOW us, but unfortunately it is a game of patience right now. You cannot fit a Magic Keyboard into a MB 12" chassis, so it would need to be redesigned with a deeper body. In my mind I'm thinking...."does it really take six years to get a sequel to my MB 12"? I guess so, maybe seven. The answer isn't to buy an Air, it's not the same product. So I will wait, as I am forced to. But I will be really awed if they can beat the weight of the 2.02 lb model I have, and if they don't and its released as a 12.5" with a body like the current laptop line and weighs around 2 lbs, I'll still buy it and be happy with it! And if that means no issues with the keyboard or anything else, that will be good enough for now. So I think the answer to your question is, "it's good enough for now." I hope this makes sense and I'd love to hear your thoughts as well on my answer.