Something similar gets said, or at least assumed, a lot when people talk about indie games. Let me clear that up for you!
The larger chunk of indie games consists of 2D games. Why? 3D is a lot harder comparatively, and so a lot more time and money goes into it. Indie single developers or smaller studios often don’t have the budget for this. Also, art is fucking hard, okay? Not everyone’s good at drawing, let alone churning out hundreds or thousands of frames for animations for a game that has a very distinct, unique art style. Time, money, you get the idea. Developers are often forced to do the art themselves, and chances are they’re not the best at it.
So what then? They often resort to pixel art. Pixel art is… fairly manageable, and definitely easier to animate than hand-drawn graphics, and also makes it a tad easier to keep a consistent style across all of the game’s assets. This is where a lot of people fall flat on their face though. Pixel art is not by definition “retro” in any way, shape or form. Games with pixel art don’t always try to “mimic the look and feel of retro games”. It’s easy and doesn’t look super bad, that’s all there’s to it!
The same can go for the accompanying chiptune music and sound effects. It’s more doable for the developer, or at least cheaper than hiring an composer, and then an entire orchestra to play the music.
This all doesn’t go to say pixel art and chiptune can’t be used as a consciously chosen style of the game though, and there’s nothing wrong with recreating that retro feel either.