I understand the desire to mimic an existing tool, but I would find this feature (more specifically if it were limited to that) to be really annoying.
To me this is an example of skeuomorphism that forces an older experience into the digital one.
To me this is an example of skeuomorphism that forces an older experience into the digital one.
This is muscle memory that's built into every person who's taught to write. You should reuse that muscle memory if you can to make writing flow easier.
Sure if you were teaching people to write exclusively on these devices then coming up with something new would make sense but since we all go back and forth using the real world method makes the most sense.
It makes intuitive sense regardless of existing tool - write on one end, reverse to erase.