Does ‘Low end or entry level’ satisfy your interpretation better? Look at any LG, Samsung etc, ie Korean, Taiwanese and Chinese brands, the entry level usually always have external power, the mid and higher end almost always have Internal power. When it comes to Euro/US brands like Phillips or Dell, practically all their models are internal power.
I bought a Phillips 32” 4K monitor a few weeks ago, $550 AUD with internal power, all similar monitors in same price range from LG, Samsung etc were external power, hence I consider those LG, Acer, ASUS, MSI etc cheapo brands...