"Ed Nielsen" writes:

It doesn't take major crushing to create mismatch, and as to whether it is
significant sort of depends on what happens to be trying to get through at
the particular point where the mismatch occurs.

At http://www.cencom94.com/gpage.html9.html, there is a picture of a sweep
trace of some cable with hex-crimp connectors (gotta scroll down a little).

That particular sweep seems to be from a highrise building which had hex
crimp connectors every 25 feet all the way up the building. A single
hex crimp, or a bunch of hex crimps spaced irregularly, would have far
less effect. So whether this matters partly depends on whether you're
wiring an apartment building or just a house.

Dave