It lost effectiveness against delta and then became nearly ineffective against Omicron (although still helping with reduction of hospitalizations and deaths).
Non-mRNA vaccine is available now (Novavax) and the effectiveness, or lack thereof, seems similar.
[0] https://med.stanford.edu/news/all-news/2021/07/vaccination-a...
"It is now clear for men <40, dose 2 and dose 3 of Pfizer have more myocarditis than sars-cov-2 infection, and this is true for dose 1 and dose 2 of Moderna."
If you want to say your subjective group is self evidently better off with some option, then don't say you are making a scientific argument.
Unless there is some unknown, long term effect from COVID that is yet to manifest itself, it is self-evident that the comment that "It was also more dangerous to healthy young men than just getting COVID, due to myocarditis." is "Absolutely not true" is incorrect.
I can't find age-breakdown data of which specific complication causes the most death in COVID patients, but for the population broadly, it is multiple organ failure, then pneumonia and related pulmonary problems. Not myocarditis.
So if you're excluding the primary causes of death of COVID then sure, the tradeoff gets a lot less clear.
Effectively zero for healthy men under 40.
I do think common sense needs to play a part in your risk assessment.
The IFR for men between 35-39 is five and half times higher than that.
I wouldn’t mind common sense, but in lieu of that, some basic numeracy would be helpful.
For healthy men?
It does seem wise to preferentially get the Pfizer boosters over the Moderna boosters for lower dosage though, particularly if you're a young man.