With them on a planet, I can't use my Trellith ability, Klrorvis boosts, or even flux probe the planet to see if anyones scanned it. Does it have enough pros to make it outweigh these cons?

IMHO, Warp Inhibitors are only good for Storage planets with 150k+ invasion defense, and if it was scanned, they can't debuff the planet and hopefully will take long enough for you to notice the planet's trying to be taken (depends on the population it has).

If you use a mylarai build extractor before you put the warp inhibitor on, then you can always remove it to use planet artifacts in the future.

that or just demolish it.
I got quite a ton spare.

My best planets are invic, if they weren't, they'd be super cloaked. In either case, my best production planet will NOT be needing inhibitor, so I can trellith them. If you have to, put up deflectors daily. But inhibitor are only for so-so planet that you don't need to manage too often.

Thanks for the input, its a good planet so i think i'll go with more cloak