Actually it doesn't. The capacity to process transactions remains the same in that situation, the difficulty adjusts in a 2 week window at least for Bitcoin, targeting a 10 minute block emission period. In the meantime a sudden drop in hashrate would indeed mean blocks statistically coming less often than every 10 minutes but until the hash difficulty automatically readjusts over a relatively quick period of time.
I'm not sure that's correct. When the global hashrate drops it becomes easier for miners to get coins because there's less competition in the mining.
Actually it doesn't. The capacity to process transactions remains the same in that situation, the difficulty adjusts in a 2 week window at least for Bitcoin, targeting a 10 minute block emission period. In the meantime a sudden drop in hashrate would indeed mean blocks statistically coming less often than every 10 minutes but until the hash difficulty automatically readjusts over a relatively quick period of time.