Sure its a poor strategy in this set up.
Furthermore, you can't say that Ken was wayy better than CPU because CPU had a better idea of the game as a whole. It's apparent that Ken had better tech skill, but tech skill isn't what the game is all about. Character selection, stage selection, and in-game strategy is as much a part of Brawl as tech skill. On the whole, with that game, CPU was superior with a higher tier character and strategy. Winning is what makes someone better than the other, not tech skill.
IN A COMPETITIVE GAME, maybe.
Do you even know what tech skill is? Tech skill isn't even a big factor in brawl.
Ken was better than CP IN EVERY WAY, except LUCK.
Furthermore, it doesn't matter how much tech skill you needed to do a combo in melee. With enough practice and repetition, a tech becomes second nature and easy. What matters is that the results between a Ken Combo and a landmaster are the same. Near inescapable death, resulting from one mistake.
First of all, it takes SKILL to do combos. It doesn't take skill to use most final smashes, landmaster in particular. it takes MONTHS or YEARS of practice to effectively do combos. Needless to say you can learn how to perform a final smash in a matter of seconds. THAT ALONE makes the two not comparable in any form. You have to be a good player to perform combos can get that kill. You DON'T to do a final smash, which means final smashes benefit bad players more than they benefit good players. Which means they should not be used for competitive games.
Secondly, combos weren't nearly as broken as final smashes, because they had a counter: DI.
A game with smashballs is all about that one battle, that one mistake. Quite frankly, I don't like a game where one encounter determines the match. I'm oversimplifying things of course because you can kill people w/o smashballs, and final smashes are non-lethal if dealt with accordingly, some easier than others, some nigh-impossible. However, it's a different game in which different skills are needed, with a different tier list. It's different, that's all.
It's different in that your set up gives bad players a chance to beat good players.