Oh geez, when you put it like that I guess I
have to like it all now.
Also let's just ignore how Persona 5 came out after Smash 4 was completely finished, which means that during the time Nintendo were listening for requested characters Joker couldn't have been a candidate since not much was known about that character for people to form a connection to in order to really request them. But sure, real big requested character right there.
Also let's ignore how Edlegard was more requested than Byleth and how they already decided to put them in the game before Three Houses was revealed to the public. Nintendo just clearly knew the request before people anyone were say anything.
Yeah, see how he was an Assist Trophy in Brawl and not playable until the next game which was many years later, he did die... a lot. Because anytime you summon Little Mac in Brawl he kept jumping off the stage.
An Assist Trophy upgrade only happen in the next game, and see how we only have a total of three with one being unique and the other two being clones kind of goes to show that majority of these characters Sakurai chose to be Assist Trophies are because he just doesn't have a moveset for them.
If a Dragon Quest character was an extremely popular pick you think it would've made a dent in the Source Gaming Japanese poll back in 2015 when the Ballot was happening, or at the very least have some major presence during the speculation of Smash 4 DLC and lead up to Ultimate.
https://sourcegaming.info/2015/09/13/japantopdlcpt2/
Also are you really saying that SNK was an obvious pick with a straight face? Yeah, sure it was. Totally