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Of course what you say is true. I have a Dell 17" CRT (no longer in use) that's actually a Sony Trinitron.
Funny that you mentioned Samsung as a manufacturer. Samsung designs their panals but outsouce the actual manufacturing of them. They have had some bad raps at times due to their manufacturing partner choices and it's not uncommon to find two, three or more manufacturer's panals in the same model of Samsung monitor.
Regardless of all of this, each marketer attempts to gain a market niche, whether it be high end, value or low price to build their brand around. Over time the cream rises to the top as some marketers in each category consistently choose better partners than others. I'm only suggesting sticking to the cream and leaving the milk behind.