I believe what are being thought of and judged by some (not you necessarily) as hard rules are actually just guidelines as you mentioned.
And individual sites are encouraged to use their discretion in giving out available doses, when extra doses are available, to people who would otherwise not fit the guidelines. Because having doses go to waste is not desirable. So, people passing judgement may be being overly harsh.
It’s hard to speak generally about it though because rules and guidelines vary from place to place.