I really wish Apple would resurrect that form factor, as every other MacBook since has seemed bulky in comparison. Thanks to OpenCore Legacy Patcher[2], I still haven't gotten a newer mac. With a modern M series chip, it wouldn't have such rough tradeoffs in battery life and performance. I'd definitely buy it.
1. See step 11 on https://www.ifixit.com/Teardown/Retina+MacBook+2015+Teardown...