I remember having mind blown learning that the Master System has not been discontinued in Brazil, but it turns out that these newer Master System models are just system-on-a-chip consoles with built-in games and no cartridge slots. That's kind of lame.

That's like saying that the Atari 2600 is still alive and well because Atari Flashback consoles are a thing. Granted, these newer Master Systems use actual Master System hardware, but still.