Need help choosing 4k or 5k

Need help choosing 4k or 5k

I'm in the market for a new monitor. My current monitor is an Acer Predator XB271hu (1440p - 165hz - IPS). I bought it in 2016 so it has served me for 10 years and I still love it but I'm becoming annoyed by something I only recently found out was called a "Dirty Screen Effect". Over time this is becoming worse and I can't unsee it anymore.

My setup is 7800x3D - RTX 5070Ti - 64GB RAM.

I'm looking for a 27 inch, 4k or 5k IPS monitor that supports a high refresh rate. If it existed, I'd buy a 4K 500hz IPS monitor as I highly value high refresh rates and clarity. One of the reasons I'm interested in 5k is because I believe that a higher PPI will lead to a more pleasant experience. I'm not interested in OLED at all.

ASUS has launched a 5K monitor (XG27JCG) and it interests me. Obviously I'm a little worried that I might not be able to run it properly. I could use the dual mode function for the most demanding games. Especially with DLSS it's easier than ever to achieve workable frame rates. Even when pushed to the DLSS Ultra Performance setting, this still looks sharper than 1440p native, which is insane to me. I never put games on the highest settings either or use Ray Tracing. For context, I pretty much never play multiplayer games.

1. Should I go with 5K or should I lean more towards 4K?

2. 5K will eat up VRAM, but will the VRAM cost not be significantly lowered with DLSS?

3. Has IPS, as a technology, from reliability to color reproduction, been improved in those 10 years?

4. Please post your suggestions on your favorite alternate choices for monitors (be they 4 or 5k).

Thank you in advance!