People hook up their Switch to their 4k TVs all the time. Whatever upscaling trick the Switch can use to get acceptable graphics the Switch can use.

Perhaps Intel's 2015 iGPU (the one tested here) isn't good enough to render games I comparable quality at 1080p, but after eight years Intel has made some advancements too.

Integrated graphics should be more than enough these days, but very few people bother to optimise for them the way they do for the Switch. It makes sense, in a way; you can't tell Switch owners their mid tier GPU us insufficient, but in the PC world you're expected to buy a dedicated GPU if you want to play anything more complex than Candy Crush.

Perhaps with Intel entering the dedicated GPU market, we'll see more games optimised for Intel, so integrated GPUs can run games better.