Most stuff on a bicycle for the average person unless it's carbon, plastics or electronics. Including safety stuff. Some caveat if you wanna huck yourself off a mountain or do like 100kph descents on your roadbikes.
But for the most stuff? The cheap shit works absolutely fine because at it's core it's bits of formed metal with threads attached connected by steel wires. Very hard to fuck any of that up to the point it becomes dangerous. I keep seeing parts being rated as SAFETY LEVEL 5 E-BIKE READY as if the metal rod that is my handlebar usually disintegrates once I hit the ludicrous speed of [checks notes] 25kph. Your $2 Alibaba Special V-Brakes are, at worst, gonna have garbage springs so it doesn't return to not-braking great, but you're not gonna like snap them in half even if you were a gorilla riding a bicycle.