Even Rise had a ton of cosmetic endemic side-content.
Rise requires getting to HR8 to unlock layered armor and go grind outfit voucher/tickets. MH Wilds layer armor system is there at the start of HR just by crafting that specific piece.
Something something less monster mats or monster mats drop rate better so less grinding. Applicable to both games btw.
They made an entire franchise out of reusing assets and being APPLAUDED for it. All new 50 monsters? "Booo where's uhhh, red dragon!!!"
I guess, new game means new village, new maps and zones, new weapons added, weapon balance changes, new weapon moves and new armor skills for better or worse don't really count? Also, monsters AI and behaviour may get additional changes according to weapon improvement through the games.
Pokemon series get berated for not having all previous pokemon to latest installment. I don't see why MonHun would be an exception.
Wannna know what is so special about Rathalos or re-occuring monsters themselves? Beside the whole move sets teaching new players for every new installment. The skill from monster armor piece and weapon type. Rathalos armor pieces come with ATK boost and/or Crit Eye. But Wilds decides Rathalos set should have Evade window, constitution and adrenaline instead.
More or less, the frequently return monsters have more useful or useable skill and weapons. Now with the whole layered armor system, at least monsters with good looking armor sets should return more frequently even if their skill set and weapons are subpar or niche.
Oh wait, Capcom guts armor set appearance differences between blademaster - gunner and alpha - beta. Nah, lets sell more generic layered armor set as paid dlc instead.
Edit: Almost forgot, weapon trees in MonHun before World.