I think I understand what Noir is saying. See, here's how it works, with estimated numbers:
Low Level - tech:mental ratio is about 5:1
Mid Level - 3:1
High Level - 2:1
Semi-Pro - 1:1
Pro - 1:3
Just an example of the idea. To elaborate:
People who have been playing for years but have never learned even the simplest tech may be able to space well and time everything properly but they have almost no options in their game and whoever in the group of players learn some basic tech skill well will instantly dominate the rest of the players. This clearly shows how technical practice improves their game by a much larger amount than mental practice. Even if the player who practiced the techs was a poorer mental player, the other non-tech guys wouldn't stand a chance because they simply can't move as fast.
At mid levels where everyone can L-cancel and people can wavedash a little bit and maybe they know some char-specific techs, learning more technical skill is still largely in favor. If you're playing a Fox that can waveshine, SHFFL, ledgehop, and combo well against a Marth who can just L-cancel and wavedash every now and then, no matter how strong Marth's mental game is, Fox is gonna win.
As the level of play gets higher and higher, putting time into technical skill loses value against practice with real players to gain experience and mental skill. Unfortunately, it's still very, very important. I was at a tournament last weekend and I played my friend in a tourney match. We both know that I'm the better smasher (more technical) but he can play very intelligently and he can beat me maybe 1 in 3 games. The whole tournament I was out of practice, not warmed up, and pretty much playing on autopilot, and I was able to win the set 2-1. He proved a surprising challenge, but afterwards talking to him about it I heard of how he carefully watched everything I did and abused my weaknesses, spaced better, and basically thought through every match for all the advantages he could get. Why didn't he win? My greater technical ability, while not even very much above his, was enough to essentially substitute for my lacking mental game and allow me to be a "better" player.
Even at a high technical level, tech skill can outweigh the mental game; for example, you may have a Fox that can waveshine, combo well, shine spike well, chain grab, and more that really isn't missing any techs and you can do all of this on the fly. You're still going to get destroyed by a Fox that does everything you can do but faster, SHFFLing everywhere, spacing better, Thunder's Comboing every chance, and capitalizing on everything. Here's where stuff gets blurry: is this actually technical skill? He's probably playing too quickly for it to be mental, because he certainly isn't contemplating the match, but what is it? It's experience (leading to muscle memory).
This is what we're getting a bit confused about. Technical skill is only built through hours of practice at lower levels. The better you get, the faster you learn muscle memory for complicated maneuvers from playing good players rather than just playing alone. The only thing you really need to do alone is practice some techs that you couldn't figure out and experiment with on the fly in a match (ex: if you don't even know what kinds of jump and laser combinations Falco has but you want to learn them). Otherwise, you just play good players and concentrate on what you're doing. Your "tech skill" is now more consisting of experience which built reflexes and muscle memory to allow you to perform everything you know on the fly more efficiently and reliably and leave your mind more free space to work new solutions and watch your opponent's playstyle. When your fingers and subconscious brain are performing fast spacing, tech chasing, and fluid combos that you've done countless times, your conscious brain can focus on a whole lot more to improve yourself even further.
To recap: the progression is "technical skill", then "experience", and finally "mental game."
If you have any questions/qualms with anything I said feel free to discuss it.