Yes indeed, but lets say for example you have a strategy in which you only find 2 trading opportunities per month, have a 90% win rate and a 5R win per trade on average, risking only 2% of your account would be an extreme waste.
Sorry but what? How many % you risk is determined by how many lots you trade, unless you have an underfunded account.
Anything that has a 90% win rate has to have miniscule returns not 5R returns. Much like buying options vs selling options. A lot of option sellers claim 90% winners until that one big loss wipes out all their profits and their capital as well as the Optionseller.com guy. The number of contracts I trade when I buy options is 2% of my total capital per trade. That way, even the worst case scenario, the most I can lose on that trade is 2%.
It is your monies, do as you please with it! I am only here to express my opinion based on my actual trading experience.