It was my understanding the 3600XT and 3800XT performed better than the non XT versions.
Barely, boost clocks were pretty much identical and watts went up (obviously), simply same die and chip, nothing special at all. Allowed AMD to price them higher. Look reviews on XT models if you don't believe this.
With Apple moving to 5nm or lower a lot of 7nm capacity will be freed, heck even for AMD as they'll move to it later in the year with first products probably launching in 2022. Now 7nm capacity constraints will lower considerably & if console (6nm) leaks are to be believed then it's only a matter of time that supply will likely exceed demand especially for their CPUs.
Apple is already using 5nm, they have done for almost 1 year now. iPhone 12 uses 5nm and released Q4 2020. Apple soon moves to 4nm for iPhone 13 with release in Q4, TSMC is probably already spitting out chips or they will soon. Apple always gets priority at TSMC. This is the reason AMD still uses 7nm even tho 5nm is ready and have been ready for a long time. TSMC would not be where they are today without Apple and Apple chips would not be world class without TSMC either (mostly because Apple ALWAYS uses a better node than everyone else - but architecture is great too - Jim Keller was/is behind).
Apple's M1 chip have been a huge succes and they will take alot of TSMC 5nm going forward. Sales exploded.
M2 uses 4nm like iPhone 13 SoCs tho.
So yeah, when Apple is "done" with 5nm, AMD can use it. Pretty much. Apple will still have some 5nm capacity tho, alot actually. Apple produces "older products" for a long time after new ones come out. Nothing new here. It's their "cheap alternative" instead of making low-end devices, they simply keep selling last years models.
ALSO, capacity is not the only problem right now. Materials are too. TSMC is not spitting out chips 24/7 because of this (and power outages happen alot right now - google it) + demand is still way higher than supply. Ryzen 5950X is almost a halo product, yields are probably bad but this is as close to a paper launch as you will get. It's pretty much NEVER in stock. A friend of mine have been waiting for this chip since release, and he ordered 1 minute after release. From MINDFACTORY. He thinks about cancelling it, because AM4 is EoL soon and AM5 is coming next year with DDR5 and PCIe 5.0 so why bother this late.
I won't be buying ANYTHING CPU, GPU or RAM related till mid/late 2022 or even 2023. Truly next gen stuff incoming and supply/prices will come back to normal.