To be fair the power management issue is pretty much a niche issue at this point. Sure if you run closed down hardware like a Mac book don't except your drivers to work from day 1.
If you go for a ThinkPad however there are usually no issues. Plus you can usually fix the power issues by just installing the right drivers or disable one or two well documented settings
S3 was disabled on some models which meant for the first 6 months of release you couldn't go to sleep.
The new thinkpad yoga x gen 10 uses a intel webcam which uses a special binary blob and doesn't work out of the box, but only if you buy it with windows installed, which makes for a fun game of "does-this-laptop-support-linux-out-of-the-box"
The thinkpad x1 carbon gen. 6 has problems when waking up:
* Sometimes not waking up until you plug in a power problem
* Sometimes having to disable/enable the trackpad to make all buttons work again.
I'm quite happy with using linux on my devices, but many modern thinkpads have issues.
My linux ThinkPad has a roughly 25% chance of failing to sleep when I close the lid, causing it to go from 100% battery to completely dead the next day when I take it out of my bag. I've caught it not even turning off the screen sometimes (you can see the glow through the crack).
If you go for a ThinkPad however there are usually no issues. Plus you can usually fix the power issues by just installing the right drivers or disable one or two well documented settings