I quite agree and that's what I used to do. But the operator, regulating for the lowest common denominator, regrettably said "No LAHSO - the crews aren't familiar enough to use it"...and required crews to make ATC aware of it. Which is what I meant in my first post.
That was 4 years or so ago; now that the word has got around on LAHSO I concede that what you say is correct. Tell them if you're unable to accept (and that may be because the opeator's bean counters won't accept the increased brake wear and engine usage from max rate braking to achieve a LAHSO landing), otherwise you should be expected to comply with a LAHSO clearance.