Anecdotally, you don't know that, you don't know what caused you to have a mild case, if this had happened a year ago you wouldn't be giving credit to a vaccine.
> it does seem like this virus is bucking the trend and not necessarily becoming less potent
Don't you think it's possible your very mild case might be evidence against this claim? Anecdotal, of course. I haven't seen the data for infection vs hospitalization/fatality rate for the Delta variant against previous ones, but it just seems to me that someone having caught it and had a very mild case wouldn't logically jump to "it isn't less deadly."