I could not find out either here or at wasabiwallet.io if Wasabi can back up wallets that have 24 word seeds.
By default Wasabi wallet is generating new wallets with 12 words and there is no alternative option to choose 24 words.
I didn't try to recover 24 words myself but I found on their github faq page that Wasabi is supporting recovery of 24 words also:
https://github.com/zkSNACKs/WalletWasabi/discussions/6177I one tried to CoinJoin 0.2 BTC way back when, and it did not work. Yet, the below link (maybe there have been some changes?) says that Wasabi will support other amounts than 0.1
Bigger amount should work without any issue, 0.1 BTC is minimum amount at the moment for coinjoin, but new Wasabi release version 2.0 will implement any amount, even smaller than that.
Interface and other improvements and changes will also happen in new release, but let's wait and see