The last three years I’ve played the same course probably 90% of my rounds. I’ve been keeping birdie/eagle stats along with all the other metrics I track. I’m a +1.9. I make 2.7 birdies per round.
What Jon said is right, most pros are making 3-4 per round. The reason for that is opportunity. These guys are smart and really really good. They know when to strike and know when to play for par. Most courses are only yielding about 7-8 real opportunities to play aggressive. Of course from time to time you’ll birdie a hole you had no business birdying. You bury that 60 footer. You chip in or hole out. Those happen. Most of the time, though you have to look at which holes you SHOULD play for birdy.
Knowing the odds, assessing the layout, pin position, elements - all of it is information. Knowing more in advance gives you a better chance to stand on the tee box and know ahead of time whether or not you’re going to be aggressive. Whether you can pick an aggressive line or not and will your miss put you in jail or still yield a good chance at par.
For amateurs like us maybe it seems like overkill to assess so much rather than grip it and rip it. But if you know true opportunity versus risk and potential blow up, I guarantee your scores will drop and you’ll make more birdies than if you’re just trying to birdie every hole.