No I don't and It's not the question I was responding to.You haven't given any good reason for why they wouldn't use the site to site if they have it.
The question was when Site to site transporting was first used. The answer is it's been a thing since TOS ( and probably before)
Is this a rule? Where is this rule? can I see this rule? Are there other rules?Only In universe explanations are valid in such discussions or all discussions are moot. You haven't given such explanation and that's because there is none.
I can make something up if you like. It's won't be based on dialog or anything from the show, but it will be a reason.
The bulkheads on starships make the site to site transporting of wounded crewmembers risky. So Starfleet Medical Regulation 24B.6 recommends that it not be used.