Why do we need app-specific chains

App-specific chain is the type of blockchain, designed to be used for one app. Instead of building on top of Ethereum, you develop your own chain from scratch.

This solution provides a ton of benefits:
🟢Customizability: developers can choose whatever stack they like
🟢Sovereignty: appchain works independently from other systems, so if some other system “crashes”, appchain would still work
🟢Costs: the app doesn't compete for block space, so there is no gas fees growth.

But it also has drawbacks. Main are:
🟢Lack of composability: different apps would need to interact by bridging, which requires block space.
🟢Running price: infrastructure is built from scratch and requires money & team to run.