Another con I want to point out is that I'm sensitive to bright light and the whiteness on this screen is quite bright. Ideally for a 27" screen, you need to be able to handle bright light. I have adjusted the brightness meter to 50% but it hasn't made much of a difference. I think it's the size. I might go back next week and have it exchanged for the smaller screen.
Turn on night light, will yellow stuff.
During the night I usually put my monitor down to 20-30%, it's nice having the option to go higher, and especially useful if there is a lot of light from behind.
In your case I'm pretty sure it's not because the monitor is bigger (though it's a little bit of a factor), it's more that you came from a really bad display to an okay one, the budget monitor segment got a lot better the last 2/3 years and one of the main improvements were most back lights being better/now able to operate at higher nits. I would hazard your old monitor was 200 nits (cd/m^2 of luminance, so how much light per square meter), new one is probably a max of 300 nits. It will probably be something like the new monitor at 50-60% brightness will be the old monitors max since it will have a more even shine.
I suggest you download clickmonitorddc or monitorian (
https://github.com/emoacht/Monitorian) and then quick adjust the brightness as needed between content.
As mentioned the pixels are larger, in order of pixel size:
27" QHD (2560 x 1440): 0.233mm, 109 ppi <<-- mine
24" HD (1920 x 1080): 0.276mm, 92 ppi <<-- yours previously
27" HD (1920 x 1080): 0.311mm, 82 ppi <<-- yours now
So effectively you have the same desktop, just zoomed up from 24" to 27". So the fonts are larger and the pixels more obvious.
There's more to a monitor than just pixels, color accuracy, ghosting, etc. all matter as well, but yes, I much prefer a 1440p over a 1080p display at 27".