IMO using 1 character, instead of 10 to 20 alts is more useful and not so stupid.
Anyone that uses 10-20 alts uses them to get around some kind of inconvenience,
like companion alts that basically just stay at your base to hold companions
or as one-trick-ponies to abuse some kind of mechanic,
like companion camper alts.
I don't see why having alts that are actual characters with actual playstyles is a bad thing.
Snipers, sneakers, melees, spammers and tanks play differently, so why not add more possibilities?
You are not forced to play these builds. You should just have the option to, if you want.
Also, alting hasn't even decreased that much after 2238.
People still have at least one dedicated crafter/miner and most likely 2 fighting builds.
1 for PVE which is probably also a lockpicker/trapper and 1 pure PVP build.
People make alts to abuse companions, cap-spawn at shops or for fast-relog scouting/looting.
To me it seems that you guys just get scared or annoyed when you hear the word "alt",
but it's actually a good thing to have more than one character if they're all fun and play differently.
Otherwise people just get bored after a while of playing their jack-of-all-trades tank.