Good question. I wonder I didn't see your comment in the SN notifications.
Moving to new wallets will bring some advantages:
  • new types of addresses
  • moving away from a heavy loaded wallet with many many txs and UTXOs
  • consolidation into clean UTXOs and decent size of them
  • better coin control, you can consolidate /swap / coinjoin the ones that you don't want to keep them in your wallet.
  • better spreading of your stash
  • disconnect from the past