Reading this on a Early 2015 MacBook Pro, which seems to be chugging along just fine. Its obvious innovation has kinda plateaued but its probably not a bad thing. To think that the same 14 NM Intel processor, is still a part of this generation of notebooks, in itself speaks to how much the need to always be upgrading is not really necessary anymore. Sure, its a more optimised 14 NM, but, 5 years later and Intel can't provide 10 NM node is concerning. This in a sense causes some chain reaction in the products development, so much so, Apple couldn't even bring the 10th generation to entry level and mid-range models; which are still on 8th generation; mostly likely to make it distinct enough.
Outside of that, what I believe Apple needs to do is really bring back the 12 inch MacBook. I kinda realise, there is a need for it as a middle ground between the iPad and MacBook Air/Pro 13 inch models. For the past couple weeks, I have been using my Early 2015 MBP at night and its not great as a nightstand computer. My iPad certainly is, but lacks the power of macOS. But macOS also lacks the variety of applications.
I do hope when A Series is introduced, its this middle ground form factor, with the best of macOS and iPad, easy to pickup and put down beside your nightstand, not too big or small. Apple should just give Adobe and Microsoft substantial resources to help bring their key apps to macOS on A Series since it will help drive third party developer motivation to get their apps over. They can then use the A series as the catalyst to drive out Intel out of the product line slowly, but surely.