In my opinion Mylar is not needed on a CC playfield in a home environment.
I would leave it around the Pops though.

Leave, polish, play.

Agreed. If there's no bubbling, it would be too much of a risk for me.

I removed mine from the right loop because slowly rolling balls were catching the seam (and then following them) too often.

I'd remove mylar in cases like that, where it affects gameplay, but if not, then I'd leave it (unless perhaps it was *really* dirty and un-cleanable).

If the mylar is over the fish inserts I'd be worried about it lifting some of the paint.

I just removed all mylar on my fish tales. Came up without loosing any artwork but getting the glue off was a royal pita! My first time also...sanded inserts to remove worn artwork...installed new tacklebox decal...$88 for leds from comet.. Came out better than i expected.

It looks like someone has added the large Mylar shown here on top of the chipped up fish inserts after they became worn. I think only the upper right and pop bumper Mylar are original. (those were on mine)

Removing the large piece will leave the chipped up fish inserts exposed and probably take some paint with it. I would not take it off unless you planned to touch that up that paint. Large decals also leave a seam on the playflield to catch slow rolling balls. You can clean up the Mylar like plastic with fine Novus.

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Mylar in the pops area and in front of the slings is always a good idea. The ball just hammers the playfield