I was thinking less about forgetting your derivation path and more about if you ever needed to use some different piece of software.

As I said above, you can easily back up your derivation path alongside your seed phrase, and therefore have no additional risk of losing your coins. The issue would come if you want to import your multi-sig in to a different piece of software for whatever reason that does not let you specify arbitrary derivation paths.

If you back up your full descriptors and always use the same version of Sparrow then of course there will be no problems. But it is fairly easy to imagine a scenario where you need emergency access to your funds and you are forced to recover the seed phrases using different software, perhaps on a different OS, perhaps on mobile instead of a computer, and so on. In such a case it is always going to be an easier process if you have used the widely accepted standards rather than done something unique.

It is of course up to you - just explaining my rationale behind preferring to stick to standard practices.