I firmly believe that a good TA wants you to get lower prices and better deals. They are responsive to questions and requests. They understand that running their business that way it helps drive future business.
My TA is ridiculously responsive. Yesterday, as my wife and I we picking excursions for an NCL cruise that we booked a while ago, I came across an upgrade package that would save us a few hundred dollars. For some reason NCL's website and app wouldn't let me add it, so I sent him an email asking if he could find out if I was allowed to book it. An hour later, I got an email back saying he had already added it to our reservation.
During COVID, he rebooked a cruise for a small group so many times that we were able to tack on a 5 day B2B cruise with some savings left over. Of course he made sure we had 2 balconies next to each other so we could get door between the balconies open AND stay in the same cabins for both cruises.
Of course YMMV, but for us getting a customer focused TA has been very beneficial and I like to think we are worthwhile clients for him.