These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Feolthanos and his mooks levelling up to Level 99 if you do all the sidequests.
They Changed It, Now It Sucks - Revenant Wings is totally different from FFXII. It's an RTS, the storyline is classic RPG fare that focuses upon Vaan and not the adults, few locations return from the original, and most of the plot and events have nothing at all to do with what happened before. Ironically, it's a sequel to a game that got this exact same response.