KP wrote:

Include what you *think* the weather conditions *might* allow your VFR
cruising altitude to be if you feel like it but "VFR-On-Top" alone is your
*requested/assigned* IFR altitude.

Once you report reaching VFR-On-Top and the controller reclears to to
"Maintain VFR-On-Top" he isn't responsible for separation. After that he
doesn't really care much what your actual altitude is now or might be later
(beyond verifying your Mode C for traffic or idle curiosity).

Any altitude restrictions issued *before* you reach VFR-On-Top are a
different matter.

Yep and here 99% of OTP is from the night cargo haulers in their 99's
and Airliners. Their IFR flightplan is prefiled and as they taxi they
request OTP and say "I am OTP at this time." So we don't give them an
altitude, just "maintain VFR on Top."