If Marriott does not want to thank retirees, why do they grandfather LTPP with months advance notice
For active frequent guests they would not need to give lifetime status, while less frequent former frequent user appreciate that and more chances to use the chain than others.
At least giving LTPP does not work for on-going users. Exceptions are those who are very closed to 750 line but it is limited to 2018 only. Some would say LTPP and LT have different purpose but there should be disappointed people once losing incentive to use the chain and leaving MPG as possible. If either LTP is the highest or LTPP is achievable after 2019, that would be different though.
I do not know how MPG marketing person aimed but this is humble feeling as a person (PP+A and LTP) who has lost the incentive and shifting to another chain...