Diode laser viewing safety

In general, no.

The reflected light will not be a coherent beam, so glancing at another reflection from the rest of the room won’t do any damage to your retinas.

However, it’s monochromatic and relatively high-powered compared to most light sources. Staring at the cutting area or a specular reflection from a shiny object is Bad Practice™.

As a rule of thumb, “accidents” have two causes: somebody sets up the conditions and somebody else triggers them. You should always have three layers of defense, so any two can fail: protective shield, baffles, goggles.

You can do without any two of those three in normal circumstances. What you’re guarding against is the unexpected event punching through that last remaining barrier: your tiny niece unexpectedly bouncing into the room and watching the pretty blue light moving around the platform at eye level.