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The 3DS display tech had a pretty rough start with a very narrow viewing sweet-spot, they improved the implementation significantly with the New 3DS. AIUI the actual panel was the same but they used the front facing camera and basic head tracking to compensate for off-axis viewing in software.

If you have an N3DS you can see the display suddenly "lock in" when the head tracking figures out where you are, especially in poor lighting where it might struggle. That's not a bad solution but it obviously only works for a single viewer.

Looking Glass is more complex than the 3DS. The 3DS synthesizes 2 views, Looking Glass can synthesize many more

https://patents.google.com/patent/US11425363B2/en?assignee=L....

They advertise 45-100 viewers simultaneously. Is it really the same kind of tech? IIRC the 3DS worked for only one viewer and you'd better stay right in front of it if you didn't want to experience cross-eye.