Could u give some details on ure careers amount of rifts/bounties complete or maybe ure paragon level.
I'm Paragon 298, 364 rifts, 774 bounties and i've obtained a fairly high amount of sets like that silly ring/amulet set that gives u 50% chd from bonus had that a few times, had the bk set multiple times, full raekor set, 2 pieces of earthquake set, IK chest twice, IK Helm 3 times, IK Gloves 7 times (even got gloves twice in the same rift lol), thorns helm, even some DH set boots called the shadows heels. On top of that multiple set recipes one of which I actually use (Asheara's legs and shoulders).
Compared to the amount of legendaries i've found though yes it's a small amount of sets but that's likely because there are a lot less set items than there are legendary. If I were to compare just today i've found maybe 30 legendaries of which 4 were set and one of those sets were IK gloves.
after I hit 70 I found one set item(blackthornes boots) and nothing for a very long time. Then the other day i got 2 set items back to back within 1 minute of each other. Its all RNG. I do think set items are rarer though. I seem to recall blizzard saying at one point that the better legendary items are weighted to be rarer than the basic ones which makes sense based on what i see people finding the clan i'm in.
I've gotten 2x marauder's chest, 1x marauder's boots, 1x Boots of Akkan (if that's spelled right), 1x bul-kathos sword, 2x blackthorns belt, like a billion litany rings, 1x traveler's pledges, 1x nat's boots, 1x nat's helm, and a couple other's I've salvaged since then. I also have probably close to 200 hours into the game now, but that's a quick estimation.