What you said here sounds a lot like an opinion I expressed recently. BTW I am definatelly experienced, but not really talented :).
Anyway, when I talked about standard shooting decks , I meant decks that focus on fundamentals of the game and their action cards are mainly bullet reductions (direct and indirect) and cheating resolutions, with no other options of manipulating their hand rank.
While slide is a non-standard deck, it is only one of many decks that I would call a non-standard one and most of other ones want to shoot, they just have different approach to winning rounds of shootout, usually by hand manipulation.
I have noticed that players who play often ( I play most of my games on OCTGN) are leaning towards this type of decks. The reason for it is simple, bullets reduction, cheating resolutions and cards that create advantage in the shootout do not guarantee you a success. Often times your opponent who doesn't have any extra bullets in the shootout who can only change one or two cards is going to reveal two legal four of the kind in a row and this is why you want to add cards to your deck that at least let you tie a round of shootout. Also WD + Longwei and Auto-Gatlings are "immune" to bullet reductions and are very hard to play against.