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Yes, I would automatically parse the "bread" as being boilerplate politeness -- but as with most forms of politeness, I would probably feel differently about the speaker if it wasn't there.

I think you have to take each individual differently. Most folks react well to the criticism sandwich. Someone like you might prefer a more direct approach, as long as it is not phrased in a mean way.

At some point in my career, I stopped taking criticism personally. I just realized I was wrong so often that upholding the pretense that I knew it all was too hard. For that reason, I prefer direct suggestions.

If I was teaching a child or a new beginner, I would start with a lot of praise that they're even trying. I want to get them some early wins to help boost their confidence.

Not everyone auto-parses. Unless you really know who you're talking to, it makes sense to add the "bread/condiments" to the sandwich.