Having several (and some really good storm players) around my local meta for years, I can honestly say that I might have won perhaps 2 or 3 games by casting Stifle on a storm trigger. This is either by a desperation play (they have not seen some cards in my hand) or a misplay (something that you can't count on) or some crazy/perfect set up lucky brainstorm play (again something that you can't count on)
Stifle does force storm players to play a certain way, but this it no different then the usual lines of play that they would have made anyway. Casting either Probe or discard to see what counters they have to play around is something they do all the time. It's a good card, but in no way the awnser for storm becouse of this reason.
Against Show decks, stifle on fetch and Waste on sol land is proberly the most effective way to keep Pierce/Daze usefull and delay while you hit with any clock you have on the board.
Bonus comment:
If you find yourself having a spot open in your sideboard, try
Dimir Charm. It counters pritty much all important combo pieces (tutors, PIF, show&tell, NO, Glimpse, sweepers, kills ransom small creeps and counterplay creeps like
Xantid Swarm.
If you have a lot of BUG in your local meta, have a look at
Mizzium Skin. It fixes both the
Golgari Charm and
Abrupt Decay problems.