Yet even in XI those things didn't change the overall story or like with beseiged it didn't make you unable to go to a zone. XIV has two where those things do happen one is the note which tells you coral to interact with in Sastasha and what the one npc sells in Highbridge. I guess you could say the difficulty spike that HW and SB fates have depending on how many people have been doing them is another thing. Another is which color is the good buff to get during the 2nd boss of Wander's Palace Hard as it changes every time you fight them.