I can see your argument, but I feel it's useful in its own way. Do remember not every SCH is played the same way yours is; some may switch weapons for Refresh from Bole or Owleyes, so won't be able to get TP for Myrkr, for example, so may use the strategem to conserve some MP from time to time and get a minor bonus out of it. Anyway, since it's Penury/Parsimony, it works for either Light/Dark Arts. For Light Arts? Yeah it's kinda so-so unless you need just a little nudge over the threshold for an enfeeble or something. But where this shines is in Dark Arts; that's extra M.acc for a nuke if you're willing to pop a strat, which combined with Focalization can again nudge you over a close threshold while also saving you some MP. Put it on Impact and you have less chance of short stat down durations. Pop it on a helix to ensure it does good damage to last with the duration, etc.
Granted, for rule of thumb, It's Situational (tm). But that fits the spirit of Job Points pretty well: small, situational boosts that are not necessary but do provide at least a bonus of some small benefit.

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