Thanks, Blake... your opinions are noted. The points are reasonable.
You know what else is reasonable?
The situation where someone like me has a basement full of pins, other projects in the wings, and other priorities in front. I also have a couple of kids who appreciate arcade games... and we've forged positive memories and go-to favs at shows. That someone like me would love a full-size arcade. Probably has a Retro-Pie scratching the itch. Has amassed some controls and spare parts to populate a cabinet if the right one turns up.
...then realizes his kids' favorite game is Rampage, and that one's a trickier 3-player build. And realizes the "find a cabinet" part is not so easy because arcades like pins are getting pricier all the time. And rehabbing a cab gets expensive quickly. And where to find the time, money, and space resources meanwhile since other opportunities (like rehabbing a pin with his kids) unexpectedly took up most of them meanwhile...
...then sees huh, for $300 there's a honest-to-goodness 3-player Rampage cabinet (with not one but TWO of our other short-list fave games as bonus, what?!), perfectly sized for two kids and dad, or my kids and their friends, that's turn key ready to go with no hacking together bits and bolts and boards. No lengthy process, no heavy cabinet, no ongoing expense, and freeing my time for the other commitments meanwhile.
All I have to do is let them unwrap the box and put it together, and they and I will have a blast playing right away. Meanwhile, once/if/when the other pieces fall into place for a full-size one, sure, why not. OTOH maybe I'll realize the "full size" wouldn't even be necessary and spare myself a lot of hassle.
Sure, maybe they can knock it over and break the screen. Just like I could buy an arcade today and the CRT could blow out tomorrow... have fun with that either way.
There's a perfect market for these, and it's a wide one, and I don't think it ruins the fun for either side.