nonsense, take for example JPY pairs today, a 0.05 lot short would have net you $100 + gains. you can trade just 0.02-0.05 lots and earn $20-50 each time, they can add up to a lot.
Also, it is always better to earn less than to lose money right? at least earn less is still earning compared to getting your account wiped.
What you are saying is risk management discipline which depends on ones risk profile.
Not every day the swing will be wide enough for a smaller position to gain more pips in order to earn a higher quantum.
Larger positions although riskier is easier to reach target price and can exit swiftly. Market can also prata in a second. How many times have you seen a position with 50 or more pips in the money then suddenly go into negative territory due to some stupid event/news hahaha.
End of the day it depends on what strategy you are adopting. Swing trade, scalping, etc.
For me I make it simple. Just target US$300 or more for daily profit. The faster the target price hit the faster I can relax especially during jiak hong trip. If positions stuck then nothing I can do but to let it recover since I do not have stop loss.