PoW solo mining without using a pool is only effective at brand new coins as the mining difficulty wont be high and have low total hashpower in general.
Exactly, that's exactly why the idea would be to create a cryptocurrency that is distributed in percentage terms according to the mining time and the total power provided. That is why in my example I said that even so a person or pool contributed 95% of the power would not receive 100% of the size of the block since clearly others contributed 5% of that power. To be clearer, it could be said that if I contribute 30 Mh/s to the network and you 70 Mh/s, if the reward of the block is 50 cryptocurrencies. You would get 35 and I would get 15.
It would literally be creating a coin that even "solo mining" works like a pool where all users will receive a percentage of each block according to their contribution to mining power.
The difference with pools is that you would automatically receive the coins in your wallet just like when you "solo mine" normally and without commissions.