My german isn't good enough to write it, but I do read it a bit.
Asking for disabling auto-slicing isn't useless (asking for any feature isn't useless). But without any good reasons for disabling / enabling / implementing anything, we simply wont do it.
I've only heard one or two decent arguments for disabling auto slicing and there are a whole lot of reasons to keep it enabled. If you feel like you have a good reason why it should be disabled, feel free to post / share it.