Back to the article. You can add water to all latex based paints / thinner to oil based paint. The tinting base has absolutely nothing to do with it. Say you are working outside and throughout the day you have to add a little water to keep the same consistency. If somebody really tried to add 20% to 50% water they no longer would be painting they'd be performing a whitewash or pickle finish.
More recently, professional painters are responsible for all preparation prior to painting. All scraping, sanding, wallpaper removal, caulking, drywall or wood repair, patching, stain removal, filling nail holes or any defects with plaster or putty, cleaning, taping, preparation and priming are considered to be done by the professional contracted painter.
I agree with you Richard, as a painting contractor for very many years, people are always looking to get more and more out of you. I had to give an estimate to a lady a few weeks ago who had more stuff around her home than a thrift store including heavy furniture, stuff all over the floor and junk everywhere. I knew if I accepted the job id be a furniture mover and cleaner. I also agree this article makes it seem like the contractor is out to rip off the customers. Fact is I always leave doing more work than agreed upon. It doesn't bother me since the customer is always satisfied. Just saying
To pick the right color for your space, grab lots of paint chips, place them on the wall near the trim, and look at during different times of the day to see how light affect the color. When you’re ready to start testing shades, paint sample colors onto sheets of heavy paper instead of the wall so you can move them around and not make a mess of your walls. 
Back to the article. You can add water to all latex based paints / thinner to oil based paint. The tinting base has absolutely nothing to do with it. Say you are working outside and throughout the day you have to add a little water to keep the same consistency. If somebody really tried to add 20% to 50% water they no longer would be painting they'd be performing a whitewash or pickle finish.
Another good rule of thumb is to test out colors on your home before you start. Once you’ve noted what others have done, and have visited a paint supply retailer to get some more ideas, test out a few potential colors on a nondescript part of your home just to make sure it’s what you expect. Colors that look fantastic on a tiny brochure can strike you a lot differently when they’re covering an area of a couple square feet. Try out a few options so you can compare them, and give yourself a few days to mull over your impressions. Taking this advice can save you the dilemma of what to do those 20 gallon buckets of “Green Myth” that you quickly realized looked more like split pea soup once you started slopping it on.
When I had my interior painting done, after clearing out all of the furniture, myself, I also removed all of the wall plates in all the rooms to be painted. They were a beige color and probably yellowed. The wall was originally an off white and I had it painted a light-mid grey, so those wall plates would look terrible. After pricing replacement plates, switches and outlets (Would have been way too expensive to replace all of them), I decided to just paint all of the wall plates, switches and outlets (Used just a black gloss spray paint). I sprayed the plates outside and used a small brush on the switches and outlets. It worked out just fine and the blacks plates, etc compliment the wall color. It has been 7 years and the plates, switches, outlets are holding up well.

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