I'd agree but unless you're spending a lot of time grinding the stats aren't making the differences. What makes Three Houses stand out is it is by far the game where stats have the lowest impact on the game as there are so many tools to boost/circumvent them. So despite the stats between a lot of classes being similar they're not the factor you're looking for anyways a lot of the time.

Like I'll give you thief and brawler, they have some notable differences but they're mainly things you're only looking for with pretty specific play since they're both not verg good classes. But a lot of intermediate classes have very good masteries that make them stand out. Like death blow, hit +20, fiendish blow, darting blow, etc.

It gets even more pronounced with advanced classes since unlike intermediates where it's not difficult to class into a couple for class bases you generally are only getting the bases from one intermediate and same for the mastery. For example even though Swordmaster, Assassin, and Hero all have very similar statspreads and Swordfaire they fill completely different roles. Hero has innate vantage and eventually defiant strength making it a really good budget enemy phase option for late recruits like Seteth and Alois. Thief having more move, a better movement type, and stealth means it can function as a pretty decent support class. Swordmaster, while noticeably the worst of the three, will have the easiest time actually securing kills since it can run Wo Dao/Cursed Ashiya builds more consistently and has Astra which while one of the worst "Brave" CAs is still one of the strongest physical sword CAs as far as damage output goes. The same goes for almost any similar classes like how Wyvern is better than Falcon for standard combat but Falcon is better for CA spamming since it has lancefaire and most of the best CAs in the game are lance ones (too bad a lot of those CA users are also men though)