I can understand some people don't care about the portability aspect and thus it does not factor in to the value for them personally. However, disregarding it completely and saying it offers no value at all if it's at the expense of graphics and performances is a bit narrow minded.
I simply don't have time to play games as much anymore because adulting is hard and time consuming. I've gotten many games for my PS4 that I just haven't been motivated to complete because it's such a commitment. My favorite genre is rpgs so the amount of free time sitting in front of a TV needed to finish just isn't feasible for me most of the time.
With the Switch, I've been able to take it out during my lunch time and play. Sometimes me and my coworkers will play a few rounds of Mario Kart and I've actually used the split Joycons in tabletop multiple times. More than I even expected to.
The Switch gives me more opportunities to actually play games, and, to me personally, that's more important than how a game looks or runs (to a reasonable degree). Not everyone's situations are the same, though. Just because I don't have much free time doesn't mean I'm going to call all games on the PS4 or XBox objectively worse because of the lack of portability, just like people shouldn't assume there is no value in getting a Switch version of a game even if the graphics and performance are worse.







