Just in case someone finds this interesting, SteamSpy data for RPGs from the OT, sorted by # of owners:
The Witcher 3: Wild Hunt - 1,265,915 ±24,297
Pillars of Eternity - 663,643 ±17,612
Darkest Dungeon - 588,374 ±16,586
Grim Dawn - 231,955 ±10,421
Blackguards 2 - 154,473 ±8,505
Shadowrun: Hong Kong - 129,752 ±7,795
Tales of Zestiria - 114,379 ±7,319
Final Fantasy Type-0 HD - 97,406 ±6,755
Underrail - 36,650 ±4,144
The Age of Decadence - 29,148 ±3,695
Exanima - 27,795 ±3,608
Celestian Tales: Old North - 12,914 ±2,459
Trails in the Sky: SC - 11,930 ±2,364
Avernum 2: Crystal Souls - 9,839 ±2,147
Serpent in the Staglands - 7,379 ±1,859
Frontiers - 6,764 ±1,780
Notable games not metioned in the OP:
Fallout 4 - 2,735,252 ±35,614
Undertale - 775,070 ±19,030
DARK SOULS II: Scholar of the First Sin - 526,019 ±15,684
Hyperdimension Neptunia Re;Birth1 - 228,635 ±10,346
Sunless Sea - 210,555 ±9,929
Hyperdimension Neptunia Re;Birth2 Sisters Generation - 106,139 ±7,051
Sword Coast Legends - 94,332 ±6,647
SanctuaryRPG: Black Edition - 90,519 ±6,511
Fairy Fencer F - 88,182 ±6,427
Victor Vran - 76,990 ±6,005
Gurumin: A Monstrous Adventure - 67,643 ±5,629
LIGHTNING RETURNS: FINAL FANTASY XIII - 60,141 ±5,308
Hyperdimension Neptunia Re;Birth3 V Generation - 57,312 ±5,181
Legends of Eisenwald - 52,516 ±4,960
FINAL FANTASY IV: THE AFTER YEARS - 48,826 ±4,783
Grandia® II Anniversary Edition - 39,848 ±4,321
Ys VI: The Ark of Napishtim - 28,656 ±3,664
Oceanhorn: Monster of Uncharted Seas - 27,672 ±3,600
FINAL FANTASY V - 27,426 ±3,584
FINAL FANTASY VI - 23,122 ±3,291