I've been thinking about it, and I think I've discovered what my real problem is with the new direction of the series. This new smash template is simply not as intuitive to control on a fundamental level. There's a direct connection between player and character in both Melee and Smash 64 that is instantly gratifying. You truly feel as if the character is an extension of your mind; if you can think it, you can do it. Brawl simply didn't have this intuitive feel. It was clunky, it was messy, and it was imprecise. Simply put, it was less fun to control. I felt like I was fighting against the engine, rather than flowing with it.
I'm not talking about advanced mechanics here, I'm talking about basic movement options and functionality. Hugs summed it up best when he said Smash 4, like Brawl, does not allow you to go where you want and do what you want to do with ease. Your mind and the game are not simpatico as they were in the earlier iterations. Dashing is stunted, and gimped. In Melee and 64, there's an immediate responsiveness and precision in directing your character. Dash dancing feels right, because the input you're performing is reflected by the character. Air movement feels good, because it's directly influenced by your momentum. It made sense. When you performed an action, it was carried out immediately, and acted in a way that felt right. Your character grabs the ledge at a times that are contextually and physically appropriate... There was no jarring magnet like pull that defied the physics of the games themselves. Brawl is full of these strange mechanisms. It doesn't feel, or look, right.
All observations and reports indicate that this is once again the case in Smash 4. So... why? Why is this being done? Everyone appreciates agency. Casuals and pros alike want a game that makes them feel like they're in control. You want to lower the barrier for entry? Slow the game down, take away advanced techniques... but is it really necessary to sand down the edges on the freedom of movement the series is beloved for?
I've even had a few casual players play Brawl and Project M one after the other to test this theory, and they all agreed that Project M simply felt better. They used terms like "stiff" and "clumsy" to describe Brawl in comparison. Sure, it was a small sample size, but it did confirm that it wasn't a mere matter of my personal bias.
Anything is competitively viable if you want it to be. The speed of the game doesn't bother me. The number of advanced tactics don't concern me. I just want Smash to feel good again.