Sadly, that's true, BUT, sometimes, we help. It's a very subjective business, and the details often become very important. Things like mic selection, placement and settings can change the sound drastically, so we're always looking for tips and tricks we can use to better our projects.
This forum has, as its premise, the idea that you can make very acceptable recordings without spending huge amounts of cash to do so. Klause's forum has a somewhat opposite view; Terry's forum is somewhere in the middle. Perhaps if we take the best of each, and factor in our own unique situations, we will arrive at our own personal "truth".
For example, the sticky at the top of this forum doesn't contain any earth-shattering new revelations about microphones, but it (hopefully) will help people think about how a mic works and that will help them choose the right mic for the job.
A few years ago, we had a spirited discussion about the role of mic preamps in the recording process, and we had a dozen of the major mic preamp designers here, discussing their preamp philosophy. It was an enlightening and historic thread.
And there's no simple answer as to what the best trumpet mic is for you, without hearing you play, in the room you're going to record in. I can tell you some of the choices that have worked in the past for me, in my room, with the trumpet players I've recorded, but that's about it. There's no one single perfect mic that works best for all trumpet players, just as there's no one perfect mic that will work every time on every singer.