Non sequitur. I'm trading to make money, which requires trading a system that suits my strengths and weaknesses, last I checked.
Actually the question is
sequitor. If you are trading to make money then you will be using sizing. If you are trading to be right,
just once, with fixed size, then it is more about being right.
I.e. you can make more money with sizing relative to equivalent "being right", all other things being equal. Hope this makes sense.
The thing that is wrong about the original question is thinking in terms of a monolithic trade. Alternatively thinking, when you use an Algo to trade and actually have fixed rules that make a formal (alog) system, you then are hit with the epiphany there are millions of trades, millions of entries and exits in any chart. Then, when you start changing time frames, you realize there are literally billions of trades in a day, one could have a system to trade.
"Circling the wagons" around a single trade-setup-entry-exit is what people do when they trades like it is 1970. In the 70's, a single "ticket" represents a trade. Now the same paradigm is a web interface with a series of drop down menus. But ultimately it reduces down, and is the same as, filling in a ticket or multiple tickets (OCA orders).
It is understandable if you trade with a "ticket" paradigm based computer interface, which most people do, then you want to "circle the wagons" around a single trade.
Imagine for a moment, that all decisions for entry and exit are automated and there is no "mental tax", no speed delay, no hesitation, no indecision, then reconsider the original question.
Hope that helps to answer the original question. @
Georpe is correct.
PS: "I'm trading to make money, which requires trading a system that suits my strengths and weaknesses" is also true. But the question you asked is a Sisyphus' task, doing it that way.