bitcoin is not a holly ledger, and yes there is much improvements to be made at its core.
bitcoin is holy! bitcoin is going to save us!

and please stop pretending you have any technical competence to juge about what has been or is to be done on core level.
reddit does not give you a CS degree, altho even this would not be enough anyway.
i'm no core dev, not even well versed in the details of the protocol, but the stuff i came up with was just references to other peoples work.
i looked around and saw several proposals, claiming to potentially give HUGE coding gains. i do have SOME technical knowledge, enough to form an opinion.
sometimes there's a will but no way, this is not the case with bitcoin's scalability.