It's your writing tone, man, tone it down. Your question "why voluntarily choose PHP for a greenfield project in 2019?" was enough, but you followed it with direct criticism. Communication self-help books would be a nice-read
Honest answer, just go with what your team is mostly familiar with. Surely, when you're programming, you will have a relational-mapping layer between your code and database, right? It shouldn't be too difficult to migrate from one DB to another - DBAs are there for a reason, consult your team's experts