You don't need trickery if you went with a smaller monitor. Frankly, there's no real advantage to 4k over 1440. Dots being even smaller at these resolutions isn't a huge deal... it's already fine enough. What is more important is that the dots are shaded WELL, and it does it quickly.
RTX helps handle some of the well issues, giving better shadows, reflections, etc. Things that are obvious departures from reality. Sure we've trained ourselves to ignore those things with crappier tricks that approximate what it should look like, but those are also trickery and imperfect.
DLSS helps with the quickly if you need it and doesn't change the "wellness" unless you're being really picky. Frankly, in many scenarios I think it improves things... stair-stepping on fine diagonals is reduced, which is one of my biggest pet peeves.
If anyone were to ask me about monitor recommendations, I'd say 1440 is the way to go until such time as GPUs get MUCH faster, and I don't think that's going to be happening anytime soon. Game complexity is increasing with polygon counts, textures, number of actors, ray tracing, etc, which is going to keep your GPU busy as it is. There's no good reason to throw the burden of unneeded resolution at it too.
With DLSS then you can render as if you had a 1440 monitor and stretch it out to cover your 4k screen.