When Satoshi Nakamoto first proposed Bitcoin, the first public criticism it received was around its scalability potential. Fast forward to 2021, and according to many supporters and doubters, scalability is still Bitcoin's biggest problem.

However, with the rise of institutional interest and technology, a solution to the above-mentioned problems was proposed, called the Lightning Network.
The Lightning Network solves the scalability of Bitcoin as a secure off-chain settlement. Why not fix Bitcoin directly?

Whenever a miner succeeds in mining, will the reward of the mining pool be provided to the miner immediately? To some extent, will this not cause block congestion?