Taking the LAM 3A as an example of possible ambiguous clearances, surely the 'clearest' re-clearance would be as follows:-
"AAA123 descend to cross SABER at FL150, cross Logan at or above/below FL250"?
Maybe with RNAV SIDS/STARS, CPDLC and ADS-B such misunderstandings will be reduced or even eliminated - but by that time I will either no longer be on this "mortal coil" or be too old to care! In the meantime.........