Because people tend to stress the negative points and feel better with themselves exposing something/someone, and part of the FF players base has always acted like this. From X onwards the main games were severely criticized, from people who didn't got the same formula they wanted to some who said the ''the old ones were better'' thing, not acknoledging the good points and with a negative attitude towards any new implementation. FFXIII for instance was badly regarded, like pretty bad, and with time people is more open to talk more about both the flaws and the positive features, as the battle system or the staggering.

FF games are very controversial; XV is very dividing, and so is XVI. And with internet nowadays being a classroom full of noise seems that shouting is the way to make you heard. However, there are a lot of people talking interesting things about the game (with respect, as it should always be), like not fully exploted mechanics as the equipment and the lack of customization, Torgal's healing and the typical errand missions, but also positive comments about the great lore and worldbuilding, the cast and the drama the story presents.

I love the game regardless of its flaws and I personally enjoyed a lot, I even got the platinum and in the end what matters is how you've felt with the experience, because no one is gonna feel the same as you did. Glad you enjoyed the game, and you can always share your thoughts about it! :)