In all honesty, though, C-stick spam (to an extent) is a valid strategy. While, yes, you can get predicted and punished, it can still be extremely effective. Almost nothing changes a game's flow more than a sudden tipper Fsmash from a Marth, or an Usmash from a Fox when your opponent doesn't expect it.
You can shffl your aerials all you want, and it doesn't matter if your opponent Fsmash's and out-prioritizes you (I'm going to speaking from a Marth perspective for the rest of this post, as Marth's Fsmash exemplifies the benefits more than any other character, other than perhaps Fox's Usmash, but it applies to Falco).
Now, this is only to an extent; obviously, if you want to win you can't soley spam from your Cstick. Your opponent will eventually punish you more than you hit them.
However, it should be done more often. The risk-return is very favorable, (unless you're playing Falco, then the risk outweighs the return, since a hit can equal a stock) and most players don't expect it.
Now, this shouldn't be confused with blind smashing. One should always think before one does something. However, in lieu of short hopping into an fair with Marth to counter your OP Captain Falcon approach, your opponent can simply Forward smash... You approach again, expecting the aerial, surely this time they'll try to...and they forward smash. The next time, you approach you DI away after you leap, baiting their swing...and they wavedash after you, forward smashing.
Random smashes aren't a bad idea; they're definitely worth incorporating into one's gameplay.
A rather rambling commentary that doesn't really address the main point of the thread, but...cheers haha.