From talking with quite a number of folks using LUT packs for looks, even expecting only "temp" usage, they don't really notice how much time they spend doing the selection process. They tend to overestimate the time to do manual, and way underestimate the selection time from their LUT packs.
So sorting through even "only" 20-30 LUTs, trying a few of them ... that's not 30 seconds.
You might be very unusual, and only look at 3 or 4 before applying one. And only spend a couple minutes.
Want a bit gritty? Pull shadows down and towards cyan, push mids yellow-green, bump contrast & sat a titch. Done. 30 seconds with a mouse. Ten with a Micro panel.
By the time you've saved a few stills of this stuff, you just drag them to a clip. Fast & furious.
So again, you might be someone who can use LUTs and actually save time. Maybe ...

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