Perhaps, somebody, sooner or later, will understand the vitality intensive facet of PoW has nothing to do with scalability of the transaction all through… the amount of transactions per unit of time solely relies on the variety of transactions per block and the frequency of blocks. The vitality price of PoW solely relies on the hash energy used to mine, which does not correlate with the frequency of blocks mined.
With Bitcoin, as an illustration, the frequency of blocks mined is a goal, 10 minutes, which is tailored each infrequently (one thing like 2k blocks) if miners mine sooner or slower, by adapting issue accordingly.
What prevents a better frequency is the chance to have a number of competing final blocks (and thus competing blockchains) on the similar time, which might improve instability of the blockchain and would require a better variety of blocks earlier than contemplating finality.
And what prevents a better variety of transactions per block is a perception (substantiated or not, it isn’t the query) it will endanger decentralization by stopping most individuals to mine, even by a mining pool.
PoA is not an answer to any of this, because it instantly kills decentralization and trustlessness, by reintroduction belief and figuring out validators by authority, thus letting coercion stop decentralization.
At greatest, PoA can be utilized in very consensual enterprise actions, for which nobody would try and coerce others away from the exercise.