Zelda? Mario? Monster Hunter? Pokemon?
Lots of game series stick to a formula. If I buy a Pokemon game, I am pretty sure I will have to fight 8 gym leaders and the Elite four. They even recycle a lot of the Pokemon between generations. How many different sets of bird or butterfly pokemon do we need?
There is far more familiarity between entries in the Tales series than in any of the other series you listed.
Super Mario Galaxy 2 does not play or feel like
Super Mario Sunshine, which does not feel like
Super Mario World, which does not play or feel like
Super Mario Bros 2.
Skyward Sword does not play or feel like
The Wind Waker which does not play or feel like
Majora's Mask which does not play or feel like
The Minish Cap. Even Pokemon has made meaningful changes over the years - they've incorporated new systems to manipulate the stats, growth, and evolution of the monsters, they've moved into the online space, they've designed new and expanded on existing systems that affect core gameplay like breeding, etc, etc. Core elements, core influences, core directions of these franchises have been examined and adjusted. This is not so for the Tales series.
Tales sets itself apart from the rest because of how shamelessly it relies on its only source of inspiration: Anime; most notably shounen action/drama and harem comedies - genres that are notoriously averse to innovation themselves. Piling the most common elements of those genres on top of mildly varied gameplay systems time and time again, over multiple generations, makes for a very stale and tired tradition. For the last 10 years, if you've played one Tales game, you've played them all. You already know how the story is going to progress, how the characters are going to "develop", and how the game is going to play. You have no expectation for something different.
This matters more here than in something like Halo or COD because we're talking about an RPG series. You come to RPGs for stories and characters. You don't want to experience the same story with the same themes and characters repeatedly.
Unlike Tales, Final Fantasy does make a serious effort to try something new with each new entry, despite remaining an adventure where you recruit party members, fight monsters, and save the world at the end. One game could be a MMO-inspired, real-time, action based medieval drama racked with political strife, the next could be a turn-based cyberpunk romp through an apocalyptic science fiction world, and another could be a modern take on an ROTC/mercenary group trying to stop a sorceress from taking control of the world governments.
You're misinterpreting what I mean by "change" if you think I want the Tales series to stop being a JRPG, or if you think I want Tales to adopt something that hasn't been seen anywhere else before. It just needs to try something IT hasn't already done before, and something a new anime series doesn't do every 3 months.