But it has to be done to sell old coins.
Just look at Litecoin!
It was very famous but now, nobody wants Litecoin anymore.
New coins have outscored Litecoin and it will happen again.
Right now, Tron, Cardano and Ripple will follow to what happened Litecoin.
Only few coins will keep a position as a top project and a bear market is a good time to buy fresh coins.
You have the point about Litecoin and for some old coins. But there are still those older coins that can't be avoided to hold. I agree to you about the bear market like eliminating many of the projects in the market. It's like the way to remove a huge market cap for them because everyone is going to be assuring that they've invested to the best projects and that would be bitcoin. And with the choices OP has given, I think it must include Dot and Sol too.