in terms of a decentralised turing complete state machine e.g. dapp cryptocurrencies, in my opinion its everything. the problem is sacrificing scalability and decentralisation. you can get really high TPS with dpos and dbft but then you are centralised. pow is just too slow and is going out the window as a consensus mechanism going forward due to security risks, dPoW is a mitigating solution to this, beating asics is an arms race, monero hash rate just sparked up likely someone figured out their clever asic resistance algo and now there are wild FPGAS out there centralising mining. PoW is fine for currencies but requires more safeguards like dPoW.

however for a giant decentralised computer, like eth, eos etc you need high tps. you want to be able to create an application that can be as fast as possible so you can create dApps that can offer something in the centralised space e.g. decentralised facebook.