I'm sure everyone here still keeps dead coins in their wallets to this day because we really can't do more with dead coins in our wallets, even though there is a dex platform for coin issues, but if we look at the high fees on ethereum then it will only be a waste to sell the coins and it is better to leave the coins as they are because they will never get any development from the coin owner.
Most of the coins need their own wallets. So in case a coin is dead, then the user will most probably uninstall the wallet from his laptop or mobile phone. What is the point in keeping dozens of wallets in laptop? Here I am talking about coins, and not about tokens. Tokens can be easily stored in ERC-20 wallets and there is no need to create a separate wallet everytime when you receive a different token. Even I had dozens of altcoins in my possession a few years back. I used to store most of them in exchange wallets. Only for one or two I had desktop wallets.