Why does a HGE site contain HG mats, a degraded site contains lower grade mats, but an encoded site doesn't contain encoded mats?
They do... sometimes.
I agree with the sentiment, though.
I'd much rather FDev took most/all or the regular mat's away from Encoded USSs and, instead, made Encoded USSs a better-defined thing.
Either make them shipwrecks containing data-terminals in deep space or, perhaps, make them satellites in orbit near to planets, both of which could be scanned for data.
It wouldn't hurt to expand on the variety a bit, though. Perhaps there could be "deep space probes" which could be found and scanned or "rescue beacons" which could be found and scanned too?
I dunno.
Maybe FDev are resigned to the fact that the Jameson crash site has pretty-much negated
ALL other existing gameplay related to finding Encoded mat's so they just aren't bothering to develop the mechanic further?
Also, if they're going to tidy up Encoded USSs, perhaps they could transfer all the surplus mat's back to Combat Aftermath USSs?
They used to be decent "lucky dip" USSs but are now (IMO, at least) utterly redundant and to be avoided - along with any other "scenario" USSs.