Yeah, I didn't have an issue with this. Prerelease information even said that you'd start with the original 8 characters (providing you watched the Directs or read about them afterwards). The game throws a character at you every 10 minutes if you just play regular Smash, or you can hunt them out in World of Light or unlock them in various orders in Classic mode. It's really not a big deal with how quickly you unlock new ones.
About the only bad/questionable aspect of it is how damn difficult they get, especially near the end. At least the rematch option tones down their difficulty, and I'm glad there's a rematch option.
But again, the fights probably coulda been a bit easier.
As others have said, it certainly used to be worse. Least you don't need 20 hours combined Smash time to get Mewtwo again.