It is undeniable that too many altcoins are circulating now and sometimes do not have clear objectives. For some people, they make altcoin just to enrich themselves because it is clearly visible after the project runs and after getting the profit they run
each platform needs validator and that's a must. But this is what i can call that as the disadvantage of the decentralized thing when something that we called it as a smartcontract can't be controlled caused by the blockchain itself already made it become a native protocol. Almost all of them don't have objectives because until this time most of them are securities. Just hope the smartcontract platform will give more restriction.
Of course, I agree that for each project you need to have an appropriate platform with good technical characteristics, such as erc-20. But I understand that Ethereum will not be able to serve the entire cryptocurrency market, but there are Ethereum competitors like the throne and Stellar, for example. Nevertheless, in the cryptocurrency market there are still a lot of altcoin that will not be able to survive, since they cannot be of interest to users.