Raul,of course you are correct regarding the phonostage.The potential problem that exists,is that there are really very few real audio dealers anymore.Many folks get their info on the internet,and that is where many buy from as well.I really don't think there are too many hobbyists overtly concerned with the "phonostage" match,because the subject just doesn't come up that much,as many sellers simply assume the buyer knows this information already!Hence,the usual "hot cartridges of choice" are sold.Of course the syndrome takes on another light,when some time later,the new owner is not totally happy with their sound,not really knowing the actual reason why,and the merry-go-round of buying and selling continues.Then we wake up,years later,after dropping a load of dough on "audio stuff",and begin to understand what really are the important factors in putting together a fine system.Call it an initiation fee,I suppose.
I know NO person who has not gone through this.Myself included! Best!