Adding things to a series automatically means there are some stories you can no longer tell. An addition is also a new constraint.
I can agree with that conceptually, but... practically, I've never actually
seen it. Yeah, some excessively specific things like a story told in a particular city in a particular timeframe is impossible, but anything about the stories that can be told in that scenario except historical trivia can be told in a more interesting backdrop, too. Magic or robots or sci-fi shenanigans only add constraints compared to a more mundane setting if the writer
wants them to. The stories about power and lives lived and loves lost and etc., etc., etc. are still entirely there, and with the possibility of new interactions added on. Giant robot's the exact same sort of constraint a tank is, or a knight, or a noble, or a police officer, or etc., etc., etc. Except more interesting because giant robot :V
E: I guess if I had to have a pithy quote for it, I'd say that Shakespeare is still Shakespeare regardless as to if Horatio is throwing around hadokens or not.
"robot everything" would be cool for a few minutes though until the novelty wore off.
This, however, is definitely a personal idiosyncrasy because that... basically never happens for me. The novelty stays. I've been reading fantasy for decades and the novelty's still there for me. Same for sci-fi, same for shonen, same for games of all sorts... I'm the sort of person that re-reads most their library over the course of a decade, and it's still as good the fifth time as it was the first. Admittedly part of that is because I do a fairly good job of rotating and spacing stuff out so I'm not actually embroiled in the exact same thing for months on end, but still. Everything giant robot is a proposition that has no down sides for me, heh. Won't until I can go outside and poke one with a stick, really.
E: And to your edit, honestly... yeah. Yeah, Beverly Hills Robot High would be an improvement over Beverly Hills, even if the quality was otherwise identical :V
Still would probably not watch either, but if I had to choose a poison it would be the one with boob missiles.