The kit could have been engineered so that the fenders are separate, like on the real car. The fenders could have had the chrome trim molded in place, allowing the builder to decide whether to keep the trim or sand it off.
When you tool up a brand new kit from scratch, especially one aimed at adult modelers, "sweating the details" should be part of the process. The addition of the mylar stickers to replicate the chrome trim seems like a bad last-minute decision. The kit should have been better engineered in the first place, and since it was designed to offer the builder the option of building several different model year and trim level cars, the trim/no trim issue should have been worked out. Seems odd that they went to so much effort to get the kit right in terms of detail, yet they totally blew it on the fender trim.
You have no idea what the heck you are talking about Harry!
The trim is METAL not mylar and if you built one you would know that. Please keep to subjects you are familiar with and stop flapping your keyboard.