The materials for the guardian FSD booster don't seem too bad.
Used to boost the output of Frame Shift Drives, increasing light year jump distance. — In-Game Description The Guardian Frame Shift Drive Booster is an optional internal module derived from Guardian technology. It provides a flat increase to a ship's overall jump range as determined by its Frame...
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Getting manufactured materials and data is easy to get anyway. It's the raw materials which are difficult.
That guardian stuff for the FSB booster is supposed to come from 1 planet..... if they didn't change that. Gonna try this soon though.
Yes they are available on one planet (although you might as well get weapon blueprints for other guardian tech when you're out there so that's a second site and the guardian beacons if you want the remote ships), its more the travel to them, especially if you don't have decent jump range to start with (getting the meta-alloy and data scans can be a pain but at least you only have to do it once) although once you have an engineered FSD its not that far.
The real killer in terms of grind is the shear repetitiveness and time it takes to get the blueprints - you have to drive around to activate the pillars (twice - once to get them to pop-up out of the ground and once to charge them), deal with all the guardian defenders, and put a relic into the machine to get 1 blueprint - bring plenty of refuel and rearm mats, your gonna need them....
For the mats themselves its shooting pillar covers off and then collecting the mats that don't always like to obey the laws of gravity and physics and stick high-up on the pillars requiring Scarab gymnastics to get or dislodge them (you can't shoot them down), its a truly frustrating, repetitive and time consuming grind-fest to "stock-up" rather than just grab one or two blueprints.
Since you need blueprints to buy each and every Guardian item rather than once to unlock and normal mats/goods to buy you need to do all the above and then re-log and rinse/repeat many (so many) times otherwise you'll be flying back and fore to Guardian sites in your sleep.....
That's what I meant by "more mats grind" its a real grind-fest!
