Losing is part of successfully trading. If you treat losing as part of trading then you are an experienced trader.
Sounds like a gambling philosophy, still could not ignore its meaning. One of the basic thumb rule of trading is we cannot prevent losses but we will be able to cut the losses early when it will be very small. Yes, losses also a part of trading.
I don't think it is much of a gambler's philosophy than it is trader's way up the ladder of profitable trading. Losing is inevitable in a financial market, because there are countless factors at work at any point in time in the market. Understanding just that, puts a trader in the right position to research and develop ways out of such losing proposition since the market have proven to be cyclic in nature.