> I'm left-handed and I will use whatever tools I can get my hands on to the fullest of my ability.
I'm not sure I can get you to look beyond what you yourself can do, but try to consider these groups: older people who will not learn precise right hand movement anymore, people with temporary or permanent right hand injury, people with no right hand, people with missing right hand fingers, etc.
And consider what do you actually lose from your side if the UI can be tailored to dominant-left-hand usage.