Can Guardians use other class abilities example Titan using a nova bomb I feel like I’ve read that they can use other class abilities but chose not to
I feel like I’ve seen a lore entry where a Titan uses a golden gun to take out a knight but I can’t remember is there any lore entries that show this or anything similar
MyNameIsByf has a video on that.
He's the lore master to check.
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My understanding is that yes, guardians can use other supers, however they are far more proficient with a particular skill set.
Just like how you CAN shoot a basketball, but may be a much more gifted swimmer.
Yes, NBA players can swim.
However they aren't going to dedicate time to master skills that don't naturally fit their body just to lose out to a Michael Phelps.