I've never watched this particular stream, but I've watched a few others. I expect many (most?) people are like me: they watch the stream on their TV while doing something else, or they stick it in a corner of their desktop, or on a spare monitor, ditto. Either way, if you go much past 1080p - at least for the region that's being streamed - it stands a fair chance of being hard to read.

(If you use a single monitor for coding in the privacy of your own home... well... what can I say? It takes all sorts.)