I am going to step in here because I presume that you assume I made that post. (Apparently I get persecuted in absentia.) I didn't post it ... but ... did you actually bother to follow that link and read what it said? Didn't think so.
This page spells out very clearly the various alternatives for queries in DBI ... straight-up queries, prepared queries, and prepare_cached. What use-case each alternative is intended for, and when and why you might want to select each one. Although I have not canvassed every programming language's implementation of an SQL interface, I do think that prepare_cached is an uncommon option that might easily be unfamiliar.
It really doesn't answer the OP's question #1, but I think it's an excellent response to #2.
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