Hideous? maybe tasteless or lazy .
Lazy because it's easy to drop a late bed on as chassis and not repair an original or buy a repro box.
Adapting a box to any chassis is as easy as sitting it in place and seeing where the mounts are and fabricating angle mounts to on the chassis. Almost all pickups use the same basic method.
The original style works because it looks like it "works" for a living .later boxes are all about contemporary styling not practicality.