Ignoring the lack of updates if the game is buggy, games back then were also more focused on quality and make gamers replay the game with unlockable features based on skills, not money. I can't count the number of times I played Metal Gear Solid games over and over to unlock new features playing the hardest difficulty and with handicap features, and also to find Easter eggs. Speaking of Easter eggs, you'd lose a number of hours exploring every nook and cranny finding them!
Well the new Tekken games launch with more and more characters, besides 7 which did launch with less than 6, and if you consider that the price of games has gotten cheaper due to inflation since the first Tekken it starts to make sense that they're trying to make more money off them. Games have been costing more to make while costing less to buy for decades now and the industry is reaching a point where that's become unsustainable but people just won't accept a larger sticker price and longer development cycles so studios are finding new ways to make money. Personally I think selling characters as they come out for a few bucks is actually not a bad thing in fighting games, it keeps the games alive and interesting for much longer so long as it's done well.