Is the poster sure or have they checked that the gains and perceived higher level of focus are not just because of the Change? Rather than the actual change? Maybe in a few months a bigger monitor will suddenly work better not because its bigger but because its a change?

Personally i love a big monitor, i use 32” screens (but only 1 at a time) on my Mac, pc and gaming pc. But in reality i do most ‘real work’ on my 16” mbp. And i drop the res to make everything bigger snd nice to read on the laptop.