I have a wife and 2 daughters, and we don't have the issue with our 40 gallon tank heater. I've taken showers while the washer has ran too, and only thing I missed was some water pressure. Tankless will do nothing for pressure.
Just because I have friends that have had bad experiences, doesn't make me or my comment "dumb."
Plus at old house (about 6 years ago) when I needed to replace the water heater, I wanted a tankless and the plumber talked me out of it, even though it would have made him more $...
You stated "And requires more maintenance, generally never lives long enough to realize the return on investment of initial cost, etc." which is not true. Thus the "dumb". Sorry about your hurt feelings.