Hi there,
Yes there are different level of tongue tie. My baby had a mild one in the eyes of the professionals and they say it shouldn't be affecting latching however, I wasn't able to latch at 3rd day after birth due to the pain at the nipple because of this issue. So bad that I bleed. And my lactation consultant said she has seen more severe tongue tie cases but baby still latches very well. So they didn't quite advise me to do the release.
Personally I did it ($350sgd) for my baby at day4 cause I want to latch him properly and that if it were to affect his speech later in life then might as well do the tongue tie release now where it's all easier. After 1yo will need to go through GA for the snip.
Maybe you could go to your PD and discuss with him/her?