The reason people argue with your method is because it's unnecessary. If you don't put an excessive amount of nutrients in the pot in the first place you won't need to wash them out. You save money, plant food and time. Plants convert nutrients into usable energy. It doesn't just suck up anything you put into the soil. Flushing the soil wont do anything positve for the plant, unless you've over done it on nutrients. Bottom line, no one really cares. If you want to make more work for yourself and a potential mess go ahead. But it's as pointless as boiling your roots to get a couple days head start on a cure.. live your life though.
Don't assume anything about excess, let's assume that moderate feedings have been implemented throughout the duration of the grow.
Do I save money continuing to feed, or use distilled water for some ending period duration to be determined by the individual.
Yep, plants convert things into usable energy for themselves to use to grow, we are in agreement here. Actually I'm thinking osmosis might not agree with "It doesn't just suck up anything you put into the soil. " can the plant chose to shut off osmosis?
Soil... no comment
No one cares, yet many are adamant to point out how "wrong" it is, or to tell new comers that it's a "waste of your crop" or any other paraphrasing that I don't agree with.
Pouring distilled water is more work than mixing up nutes to you?
I agree, boiling roots was a waste of a few runs of experiements. However, again I'd say I could point out discernible differences between those I boiled, those I flushed, and those I fed. Others say they cannot tell any difference. I chalk this up similar to deaf folks in the chat room, just because you cannot hear the noise or buzz doesn't mean it isn't there. You just may not be sensitive to it.