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.
You will want to use the highest quality exterior home paint your budget will allow for your project -- not only because it will look the nicest, but also because it will save you money in the long term by offering better coverage and durability. Better coverage means fewer coats and fewer work hours for your painter; better durability means that you won't have to spend money to paint the exterior of your home again in just a few years. How do you know how much paint you're paying for? Here's some helpful math:
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During the walk through, I enjoyed that Rich was professional and didn't argue or try to argue about work that was outside the scope of the contract. He explained that an area in the drywall above the doorframe would need to be replaced due to a bad crack in the sheetrock. The lines on the trim are straight, the walls that are dark have clean lines along the crown molding and baseboard the job looks great, the wall that needed to be floated looks awesome and I couldn't be happier. Home Painters Parker Colorado
I disagree with your criteria to hire a painter. A prompt returned call is nice but does not indicate the quality or fairness of the painter. As far as a written estimate, that should be more of a qualifier for the bid versus an evaluation criterion. I'm not sure one would have favorable results by hiring a painter on this basis. As far as the bidding process, change orders should ONLY be used if the customer requests additional scope (PMP 101). Angie's list should consider asking reviewers if/how much they were told to pay compared with the estimate. Unfortunately, there are a lot of contractors that are unethical and need to be accountable.