To add on this, it's disingenuous to say SG has richer weapon combat mechanics only because the game is built around less freedom in combat.
As much as there's many balance issues in Unlimited, like in any SaGa or any RPG really, the battle model is different to the point it's almost completely opposite in terms of scope.
Unlimited is a game that checks your stats and character build, Scarlet Grace is a game that checks whether you know how to answer a certain question for every round, both have their ups and downs.
Unlimited feels more satisfying than SG in the sense that you truly feel like you're creating a character and making it perform efficiently in a select couple of fields, it suffers from the usual problem of all RPGs where at some point you get really big numbers that snowball too hard and end up with the balance issue most games end up having, you get such a massive statistical advantage that strategy kinda takes the backseat for most of the game.
Scarlet Grace is a lot more about tactical adaptation, it excels in keeping the combat fresh and involved at a surface level compared to other games in the series, because it's built on a more puzzle-ish approach to combat, on the other hand the importance of your stats is largely negligible , unless a character has a score of 7 or below then it really doesn't matter, you won't see much of a difference between a 10 and a 15 even though there should be, which is a shame since it has the best stat design in the series by far imo, much better than Unlimited which is heavily compromised by SKL.
SG also has many, many other combat related issues such as using a really bad version of BR, terrible and overall lacking spell design, neutered forging, the lowest enemy variety in the series and also extremely limited character loadouts, which is really hard to swallow coming from the previous games, but was a necessary sacrifice to make the combat work.