I'll confess, I did take advantage of the unintended Guardian Codex giving Blueprints glitch when 3.0 first dropped, by running both The Ancient Ruins and The Guardian Logs missions together, requiring me to scan a total of 129 obelisks, which in turn turned out to scanning quite a lot more than just 129, as some of these were glitched, bugged, broken, or otherwise screwed up.
That said, looking from now into the future....
Either the number of blueprint fragments needs to be considerably reduced when unlocking Guardian items, or the drop rate or means of obtaining these needs adjusting for the sake of sanity.
This really wouldn't be that hard to improve - the simplest thing would just be to allow the same commander to scan the same data core each activation. The limiting factor here comes down to the number of Guardian Relics available to activate the data core. Raising the drop to a random 1-5 fragments per scan would also help.
The next, slightly more difficult change, would be to allow scanning Guardian Sentinels to provide blueprint fragments as well.
Between these things, this process of collecting would be greatly improved.