I just deleted a post that echoed Marovian, whilst using mobile phone and keyboard I sometimes wiped out existing tiddler titles unintentionally whilst editing - not as ergonomic as laptop - mistakes and unintentional keystrokes happen. Its not a massive issue - I just quit edit without saving and try again to edit so as not to lose the title.
I removed comment - it’s worse if I accidentally wipe out the body text of the tiddler - it’s am and I am on first coffee - not thinking straight yet.
I am changing default back to title until I have experimented properly.