This is actually a pretty interesting question which, to be absolutely honest, I feel I can't answer with great certainty. I remember when the game first came out, I was very much in the pro-3 stock crowd for a few reasons.
Firstly, I took people's complaints about games taking too long and the blast-zones being unusually deep compared to Melee and Brawl with a lot of skepticism because well, Smash 4 was a completely new game, of course people weren't going to know the most optimal ways of getting kills out of the gate. When I saw a large shift towards the 2 stock meta in local and online tournaments, I remember getting really upset. I felt like the community was trying to fix a problem they hadn't properly allowed to see play out or settle. In a lot of ways, I still feel this way about the Smash 4 community, what with huge factions at war over the legality of stages and pro-customs vs anti-customs; we're a very severed fanbase, unfortunately.
The other thing was my personal affinity for longer matches. I get that the reason Melee and PM are considered so hype in comparison to Smash 4 (and Brawl and 64 for that matter) is because of its fast pace, brutal combo games, and overall flashiness. However, I always played better as a cerebral player rather than a technical one, and being given time to plan out my motions to combat my opponent was always more comfortable for me. (Why I played Puff for a while in Melee; I have gotten better at tech recently though, as I have picked up Marth in Melee and Yoshi in Smash 4.)
Now that I've forced myself to adjust to 2 stocks however, I'm starting to gain an appreciation for it. The risk-reward factor is a lot higher in two stocks, which does make things more exciting. It also forces quicker matches, which is a definite thing to keep in mind, as a lot of Smash tournaments end really late at night. However, after watching APEX and CEO, I do think 2 stocks also lends itself a little too much to deciding winners on the first stock. Comebacks in Smash 4 are incredibly rare, even compared to Melee, and I think the relatively low stock format is partially to blame for that. Even with Melee's quick pace, the fact that it uses four stocks allows really hype comebacks to be a possibility. I dunno, I guess what I'm trying to say is despite my love for Melee, I think it hass neutered Smash 4's metagame from the very beginning. I would say we should try to distance ourselves away from Melee, to be our own game, but with the Smash community as it stands, I fear that itself might be an impossibility.