In OpenWRT I still have the legacy switch menu instead of the more modern DSA. Does this device support DSA or is it a hardware limitation?
It is a swconfig device when used with OpenWrt up-to and including 24.10. (I cannot speak for future versions...)
It does not support DSA. That is a function of the firmware development and the migration of targets to DSA. The ath79 platform has not migrated to DSA.
It is not a "hardware" limitation, though... DSA and swconfig can achieve exactly the same functional goals, but they do it in different ways. You can think of it as speaking two different languages (not counting nuances where certain words/expressions/idioms don't translate). If you ask: "may I have some water?" it will mean the same thing and get you the same result regardless if it is spoken in English, Spanish, or Mandarin (as long as the person you're asking understands the language).
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Agreed - and while DSA is the "new thing", there's nothing wrong with swconfig, and on ath79, it's a proven solution - there are things that don't need fixing 
+including snapshots right now and the immediate future.
A DSA driver for ath79 exists, and it did work in the past, but currently doesn't - so that will need to be fixed first. The second -major- issues will be coming up with a migration strategy, ath79 is huge and very diverse target spanning ~6-7 years of devices and at least four (major) distinct SOC generations, so vendors have come with quite a zoo of pretty different devices, which is not easy to convert.
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