I think there’s some historical context to this, as to why it was not in there in the first place.
Initially the Tracker allowed for USB Storage Mode. This had to be removed later down the road because the underlying library that allowed this didn’t work properly anymore - a pitfall of evolving open source libraries.
Hence deleting directly on the device was never initially considered and has become a feature request.
Considering how old this wish is and how little votes it has gotten, it has not been an urgent need by the overall community. But i agree - it would be nice to see this at some point.
For now i will have to decline and close this bug report, as it is by-design.
Hope that’s ok and let’s see if we can get more people to vote on this wish: