The problem with psionics in the past is, each power source − arcane, primal, and divine − had its own themes and niche. Since the themes that would properly go to psionics such as mind affecting enchantments and telekinetic force effects already went to the arcane source, psionics became inherently superfluous and redundant. Thus the implementation requires deep structural planning at the start of the game.
What is true in the past, might be less true in 2024. Its spell lists for each power source seem comfortable with spells that overlap several sources. Thus there is less niche protection, and more interest in simply picking whichever spells best match the themes of the list.