Anybody has the capability to bring a gun to a Sword spar, that doesn't change that I was entering the ring with the intention of a Sword spar, and you brought in something simply for the sake of winning
The average guy is going into Smash bros expecting some good 'ol fun, but when they hit the Online they'd be hit with Lag-cancels, wavedashes, things that they don't even understand what is happening to them. Is the game on Lightning Mode? Why is everyone moving so fast? Why can they all hit me and shine me with no break in between?
They'll be forced to adapt to the 'advanced' playstyle simply if they want to have a chance at a fun experience online, otherwise they'd have to abandon online entirely. Hence why Mario Kart DS is one of the least played Nintendo Wifi titles nowadays, Snaking ruined the online for anyone that couldn't commit the time and wreck their thumbs just so that they wouldn't get lapped 2 times over, so most people just abandoned trying to play Online
The entire point, the major factor why Dogen even has these views, is because of online play. If there wasn't online, go crazy with the Advanced Techniques, not like I have to deal with you unless I'm actually going to a Tourney, or if me and my buddies want to play that way. However, Online Play changes that, because how this "Metagame' plays out really affects the Online experience, and you have to take into consideration how much the Metagame would wreck anyone's enjoyment of Online play who can't commit to it as much as you can.