Ive got 3 and all of them de-lidded, I wouldnt change the water block or put the lid back on unless I was selling them, if you use the right tools, then theres nothing to sweat about, my 7900 non X took a long time to get the lid off, probably about 40 or 50 turns each way with the tool, I got bored and took to the drill for that one, my 7900X3D I could have probably of pulled the lid off by hand, only about 4 or 5 turns of the tool and it was off, its just a case of cleanup then, the solder is very soft and I just gently scraped it off with a guitar pick, you can use LM to get rid of the rest of the solder residue after that, the SMD's are already protected by some sort of hot glue type substance, and for a 15-20oC drop, yup it was well worth it, longer boosts, higher boosts, better F-Clocks.
Where Ryzen 7000 is concerned, the IHS is just ridiculously thick, and all because they wanted to keep compatibility with AM4 coolers, they should have just changed the lot, everything else changed, new motherboard, CPU and RAM required, what difference does it really make to require a new £50 cooler added to that lot, im sure most companies would have just come out with some sort of replacement bracket to make their coolers compatible anyway.
