We are talking about the DBX. Both the DBS and the DBX have an undersized scoop for their FSD class. You are right though, if you are going around a big star (like F or A class) then scooping isn't really a problem, nor is it a problem if you do a filter on your route (or you do economical planning).
It tends to be a problem if you fly as fast as possible to some region of the galaxy, and use small stars like red dwarf stars, or you hit a string of unscoopables. So, for example, when Chiggy did his famous rescue of a stranded CMDR, using a mining laser, he used an Asp because he needed to get to a remote region of the galaxy as quickly as possible. If he used the diamondback, it would have taken him a lot longer due to all the extra scooping time.
Honestly, if you are doing the type of exploration where you look for earth-like worlds, water worlds, and ammonia worlds, or just interesting systems, the scoop thing is a complete non-issue. The amount of time you spend per system if you explore in that way dwarfs any sort of extra time you spend scooping due to an undersized scoop.
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The double engineered FSD is real -- check out any human technology broker. Don't forget to add mass manager to it. My diamondback can hit 74.52 ly on a full tank, and 80.26 ly on fumes with that.
OK, I see... Since I am not in a hurry, I have no issues with fuel scooping times... But yes, when I hit multiple red dwarfs, then I need to stop occasionally in the vicinity of the star to refuel and I do that usually while FSSing at the same time...
And I read the thread with the rescue story... Amazing story... Truly amazing!