The Merge will shift the Ethereum network away from its current Proof-of-Work (PoW) mining model to a Proof-of-Stake (PoS) consensus mechanism, phasing out miners and replacing them with validators.
Miners have plenty of choices aside from mining eth, there are other options like btc, rvn, etc and many more. Maybe their just inclined towards eth pow and probably looking forward to the fork. But isnt it gonna create confusion to others? Well diverting to PoS has its advantage especially on environmental aspect and probably Vitalik feels the need to do so. Anyway some supported him a lot maybe some cant accept this but for sure he thinks a lot of this before going through it.