Yes. Related topic:
https://groups.google.com/g/bitcoindev/c/iVLHJ1HWhoUIn general, people first thought about hard-forking existing testnet4, and implementing fixes on top of that. But: if testnet coins are traded, then the whole chain can be started from scratch as well. And if it makes writing code easier, and allows to remove some additional logic, like 20 minute minimal difficulty rule, then people are more willing to implement it like that.
Also, testnet5 with premined coins will probably be traded as well, so maybe the whole idea of testnets will be abandoned? Who knows? One way is to flood users with new testnets, to make new test coins equally worthless. Another option is to focus on signet or regtest, and remove testnet support completely from Bitcoin Core.