You're far from obligated to spend money on a game you don't want. It's fine if the majority of the characters don't appeal to
you, but...I'm not gonna lie, you're acting
really entitled, here. You're missing four characters, a few of whom were very unlikely to begin with, and
that's the main reason why you're so dissatisfied with the game? Come on. Cool down for a while and reassess your thoughts, consider lightening up a little. Maybe you'll be able to better appreciate what the game
does offer if you do?. I haven't gotten my most wanted newcomer in Smash yet, nor did I get several others that I wanted like Dixie Kong or Skull Kid. Yet I'm thoroughly enjoying just about every other newcomer on the roster (Ridley, K. Rool and Isabelle were easily on my most wanted list) and you don't see me spouting any salt about how Sakurai's choices are somehow illogical and objectively bad.
You're talking about a character from a series that has a huge history with Nintendo's older days and helped codify the Metroidvania genre (

), a character from a massively successful and beloved newer Nintendo IP (
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), a new character from an already existing and popular Nintendo IP who has endeared it's fanbase and has been pushed by Nintendo in many successful marketing campaigns since her debut (

), another popular Pokemon from the newest generation (

), and an upgraded Mario mook who's addition is clearly meant to be a joke, put in just for for fun, but is ultimately harmless and has no effect on any other character's inclusion or exclusion (

). That's in addition to the new Echo fighters (
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



), who all have merits of their own to warrant getting in, and take little time to develop in comparison to fresh, unique characters, making their additions bonuses that time constraints allowed for and nothing more,
and in addition to tremendous fan favorites who've been wanted by the fans for decades (
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
), one of whom hope for was nearly lost after Smash 4, due to Sakurai's own (now no longer true) statements on the character, and whose support base was needlessly and mercilessly mocked over the same size and proportions argument for the longest time, and another who was absent for a
decade by the time he finally made another appearance as a fighter in Ultimate. Both fanbases were absolutely dedicated to their characters, and did everything in their power to make their voices heard. I absolutely doubt these two characters would've been included were it not for all their fans' years of support and hard work.
All of these characters each had plenty of reason to be in, so while some of these additions were surprising while others seemed fairly obvious, they all have one thing in common: their inclusions make perfect sense. Aside from Piranha Plant, but again, it's a
joke character, one that won't even be on the base roster. It's harmless and didn't
have to make sense. So it isn't fair for you to be calling even a
single newcomer on the roster a "stupid Sakurai choice".
You don't have to buy Ultimate, but going off of this thread, it honestly sounds as though you think that this game was supposed to cater to every last one of your personal desires and nothing else. Lighten up.