DislikedIn that case, I'll have a go.
Time is a manmade concept. Timeframe should not be a variable in determining position sizing.
Instead, what should determine your position sizing is your appetite for risk and the edge of your system - if that is even quantifiable. Theoretically, if your edge is the same in all timeframes, position sizing should be the same as well.
The issues you describe when trading shorter timeframes (e.g. being prone to more mistakes,) have a negative impact on your edge. Additionally, it can be argued that shorter...Ignored