Nextcloud asked in a poll at https://mastodon.social/@nextcloud@mastodon.xyz/115095096413238457 what database its users are running. Interestingly one fifth replied they don’t know. Should people know better where their data is stored, or is it a good thing everything is running so smoothly people don’t need to know what their software stack is built upon?
Yeah, that is the kind of concern for the service developer or a very opinionated sys admin. For self-hosting, few people will reach the workload where such a decision has any material or measurable impact.