You have to consider if going for that risky option is worth it, much like using meter in Street Fighter when you're very far behind in a round. If you want to take the chance to win, or have more resources for the next round.
Street Fighter doesn't make characters that are intentionally mediocre and become pretty good [but still not the best] when they have meter (I think... or at least, I've played it some and watched a little and I've never heard of that type of character). If Project M wants that kind of character, they really should make him pretty good each stock in my opinion, and then if you screw up, you have to make do with what you've got, rather than causing one error in judgment to leave you with a few i-frames to try to get back into the game.
If you were to tell me that Lucario was hands-down the best character in the game with meter on him, and actually convinced me of that, fine I guess, but I don't think that's the case. As a result, I don't think keep Lucario from having any meter when he respawns is a good idea. And in my opinion, it was risky enough that you get one shot to use the meter you earned from the respawn platform, and if you fail, you now have zero point zero meter anyway.
P.S: I've had this discussion elsewhere and it's never been resolved, so if you'd rather just drop it, we can - I think it's an ideological difference, and not one that can simply be sorted out by discussion. If you'd like to prove me wrong, by all means, but I've said my part about thinking we'll go nowhere.
And for the record, does this mean people here would rather Lucario start with zero meter, because one is supposed to earn it?