With nearly all the points OP has laid out, he could apply the same exact reasoning for the Switch as well in comparison to streaming ...
Why buy clunky dedicated portable gaming devices like the Switch or it's successor when streaming games to your smartphone (or anything with a display for that matter) from more powerful devices get's you a SUPERIOR technical experience AND doesn't come with technical drawbacks like maybe downgrading to a Switch ?
I'm not going to be able to get very many high quality production experiences with a Switch and there's more seamless solutions than the Switch ... 
If anyone couldn't tell, I was being facetious for the most part ...
"no big drop in performance, and good battery life, I feel like the hardware itself is good enough to justify owning it, regardless of the games"
Only in OPs dreams would this be true and that goes especially for the last part since the WII U was within a similar tier of the Switch in terms of performance but man did that system's hardware sales cratered as a result of the drought of quality software releases. Not being able to play the vast majority of modern AAA games and a 2.5 hour battery life all without it's games must be a good one to make just about anyone laugh ... 
