Eh I dunno, not sure if you can call it egoism. He cares about his franchise, perhaps maybe a bit too much, but I can't really blame anyone for that. Giving fans what they want and generating lots of money is killing two birds with one stone, ofc it's what they go for. Not sure what online games you're talking about here anyway, bc FGO is pretty much a gacha game with very little online content, like almost nothing xD Gacha games have their own problems, but theiy're the money printing rage in Japan, so every company jumps on that train. FGO just is the most successful lol.
As for writing a "short script"... well you're not enough into Fate, but Nasu can't really write short scripts lol, they always get long. And considering he's going over the whole of Tsukihime + wants to add and change stuff (like Satsuki route and the new teacher), there's quite a lot of work to do. Doesn't help that probably everything has to go over his deks
but this turned out way longer than I thought, in the end we can do nothing but wait. It will come eventually, until then mb we have a Fate/Stay Night localization and Mahoutsukai no Yoru is translated... one can dream, right?
Those fighting games look a bit better yeah, but I'm not all that interested either, yeah.
And indeed, she is
Btw, time to return the favor