Your stoma is used to having poop on it and in it all the time, water is not going to hurt it in the slightest :) It can, however, erode the wafer away a bit but if you're still getting good weartime the way you're doing it, then go for it :) Remember, with ostomy care, whatever works for you is the right way :)
On change days, I completely remove my bag (I wear a one piece) and let the water run over my stoma to get it really clean. Harriet (my stoma) loves it :). At all other times I wear my bag in the shower without a problem.
I have had an ileostomy for 31 years now due to UC.
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I'm not a complete idiot - some parts of me are missing!