(Thread Hop)
It has less to do with the fact that "universal techs are easier" like wavedashing, hopping, and L-cancelling and more the fact that it seems that PMDev prioritizes "balance" over "skill-to-reward" for most characters.
I saw this on TVTropes one time:
This has already been addressed. It adds the techs from Brawl onto Melee's so it is ultimately harder in this respect. But...
I believe PMDev made each character with the assumption that everyone would be played at the highest level, with regard for the tight tech skill-to-reward ratio that Melee is so famous for being a close second at best.
It's pretty much an inevitability when the Mighty Glaciers are far more viable here than they are or ever will be in the official Smash games. There's next to no rapid-fire button presses you need to do with them, and that's just the nature of the archetype. Melee SD Remix (which all of you needs to experience sometime) makes the Mighty Glaciers more viable, too, and IT has the same problem (though arguably slightly less).
I believe PMDev could start prioritizing the skill-to-reward ratio over balance at this point in time, however. Considering how immaculately balanced the cast is already over the course of many years, there's really no need to make huge-*** changes anymore.
However, they're still intent on making big changes. They need to realize that at this point in time, characters are more popular based on tech skill required, not how good they are.
If I could make a suggestion, perhaps PMDev could incorporate some sort of waveshine-like cancel for all characters. What I mean is that it would essentially be PM's equivalent of SF4's famous Focus Attack Dash Cancel: you would cancel your special by jumping and airdodging into the ground, allowing for versatile followups. Maybe even apply that to even A moves. That increases the tech skill needed to play by a large margin.
P.S.:
Mew2King even said this about the matter.