Tongue tie was quite obvious for my first daughter (it even runs in my family), but hospital staff still refused to do a proper diagnosis and said it was fine. It was not, and impacted the breastfeeding.
Or are you just anecdoting?
However, the placebo effect here is really strong. Firstly because tongue tie revisions are to fix issues that very often are the kind of thing that resolves on it's own. Secondly because parents are told they will see some sort of fix and they are putting their child through a procedure than can be painful so they will really want to see an improvement.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5804819/
"A desire to increase rates of breast feeding initiation and absence of standardized criteria for the diagnosis of ankyloglossia have resulted in runaway rates of frenotomy for newborn infants in some parts of Canada."
https://internationalbreastfeedingjournal.biomedcentral.com/...
You'll see a really unfortunate statement like this in almost every article discussing the issue "Randomized controlled trials of optimized lactation support vs. frenotomy and of scissors vs laser in performance of frenotomy are needed."