Not really- just having dewitching as a confirmed option gives us a major safety net both in general for if we lose someone and if Mami or the others find out about the Witchbombing. It allows us to seriously break the system in a way we haven't done so far and in a way that actually helps people- which removing grief from circulation wouldn't since it hurts Kyubey without helping his victims.In the short term, dewitching research is pointless in terms of tangible results, since even when we crack it, which will take a fair amount of time we aren't spending on other things, we'll have to be very careful about bringing it up to avoid a massive pile of problems.
Define 'short-term' and 'tangible results', please. Because having an additional hook to use on Kyuubey (the ability to deny him a resource that would otherwise inevitably come to him and literal creation ex-nihilo of the thing he set up a massive industrial depression engine for), as well as the ability to acquire literally unlimited power (create grief, grief->energy) is a pretty damn tangible result, and frankly, since it falls under our actual wish (we wished to control grief, not souls, remember?), it should take less time to do so as well.
tl;dr: It has amazing payoffs right from the start.
Short term- What can we use it for right now?
tangiable results- What does this trick do to make our life better or advance our goals?
Kyubey won't noticeably care either way other than to possibly consider us a bonus to his onetime Madowitch energy quota- and we've been over why bargaining with him is unreliable. It boils down to being unable to trust him and painting a bullseye on our backs, even more than we already do.
Destroying or making grief doesn't seem all that helpful even if they do work which is slightly doubtful. It's a step above the usual SCIENCE party trick suggestions but only just.
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