I recently got the first back in the saddle quest for the susanoo legendary fusion rifle from the gunsmith and got to the point where I needed to delete 10 points worth of fusion rifles.
Legendary= 5points
Rare= 1point
I had no rare fusion rifles and only two legendary fusion rifles (both year one) in the vault. One was murmur and the other was praetorian foil. I deleted murmur with no second thought but paused when I got around to the praetorian foil. I originally got the the praetorian foil on my very first vault of glass raid and never really used it and so I dismantled it after taking a screenshot. I regretted my action as soon as I did it.
The oracles I could of killed can see my future in destiny hell (POE).
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6 rares or 2 legendaries to do quest. Not hard or time consuming