Yeah, Wizards get scrolls ---> to know all spells; and same with Archivist.
Psionic classes need Thought Bottle and Psychic Chirurgery (or whatever the spelling is) and Psychic Reformation, and help.
There's a minor advantage to having a Mantle.
Psions can "only" learn powers on their list, so that's all 8s via Expanded Knowledge, and most 9s via Psyref.
Mantled Classes, can argue with their DM, via Substitute Powers on Mind's Eye Ardent section, that there are more Mantles than there are 9th level Powers, ergo, all 9s can be learned via Psyref with Tap Mantle feat switching.
There's also the minor advantage to having Psychic Chirurgery on your list,
so you don't have to go find someone who has it, or visit your local pSi-AM'S club.
Note: the total # of 9th level powers, let alone the lower level powers, is far far fewer than the # of spells floating around.
Thrallherd and Erudite together can get all Arcane 8s over on to any Psionic wiht 8th level powers. Not being an Erudite, keeps the nifty (M) component eliminator away. If you aren't an Erudite you can use that class feature, but you can use the (spell)power.
Erudites can use PHB2 class feature retraining to switch from Spell to Power, to Mantled, to "Disciplined"; and back !!
I forget what the last one was called.
{ ... as usual for me, splashy chaos ... }
