That depends. You don’t need quorum writes with traditional Postgres or MySQL HA setups. In most cases, writes go to a single primary, and replication to standbys is asynchronous or semi-synchronous, depending on your tolerance for potential data loss.
It’s all about finding the right balance. With modern vertically scalable hardware and fast SSDs, a single-node setup can handle quite a lot of load before hitting real limits with a failover setups.
Thanks, I agree there's a balance. I'm having trouble believing startups don't to be protected from such dataloss. It makes perfect sense (at least to me) for startups to use some standard NoSQL cloud db's like DynamoDB.
If you are a startup you can focus on product and leave the nitty grittys to an abstraction by paying more money.
