For someone with better first hand experience, how does this compare to other Rust game engines [1] [2] [3]?

Is Bevy flexible enough to let you drop down into raw OpenGL?

I'm writing code that does a mix of point cloud rendering and traditional asset rendering (I'm new to all of this), and I'm wondering if I should adopt an engine instead of rolling everything myself with a mix of OpenGL, matrix math, and Imgui.

I'm trying to do due diligence, but I'm too new to games and 3D to know what to look for.

[1] https://github.com/amethyst/amethyst

[2] https://github.com/PistonDevelopers/piston

[3] https://arewegameyet.rs/ecosystem/engines/