There needs to be a balance between security and scalability. Focusing only on security, would hinder adoption of Bitcoin worldwide. Especially when fees will rise all the way to the moon. You'll get security by paying an ultra-high transaction fee. This favors the wealthy, while the poor is forced to look for other options.
Altcoin developers break this important balance between Security and Scalability. They aim at Scalability and make it better, block size bigger, and even make it worse and terrible with super fast transaction speed; but they ignore another important factor Security.
They also make things more terrible by developing Cross-chain bridges that together with super fast block time and transaction speed, cause to horrible consequences from any hack. Then if hacks happen with massive costs, they tried to do something more terrible like Rollback blockchains.
People see things in different ways and have different interests but with me, altcoin blockchains are terrible in Security. I don't care about security of their blockchains but I must care about security and safety of my fund.