Its not solving the problems its just makes it less severe for a while. There is always an interest for miners to maximize Tx fees. You could make the block size infinite and there would still be no reason for a miner to add all pending Tx. Why would they If they can force people to pay a fee. The solution is to get rid of the fee. That's the only way you can have a system that wants the maximum throughput for the minimum cost, because no one makes money from it. Hence systems like the XRPL dont have real Tx fees they only have a tiny pseudo fee that isn't going to anyone its simply burned instead and only acts as a spam protection.