Wayne---It is unusual for a well run-in engine to have its old guides
"sticky" and in need of reaming, as you pointed out.
There are checks against data that can determine when valve stems are
too loose in their guides, by a simple rocking against and check the
numbers with a dial indicator. If the shop did this and found them to be
in spec, there shouldn't be any excess oil burning as the result of
reaming.
There should be no compression loss due to normally worn guides, so long
as the seats and faces match.
Dick
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