Besides the huge AP advantage:
Time stone: Should be able to stop time like Strange on the same scale (multiple blocks at least), as well as being able to rewind Madara's personal time.
Space stone: Teleportation spam + TK + throwing massive bits of celestial bodies and people
Power/multiple stones: Can absorb energy attacks and redirect them back to Madara
Power stone: Can shatter dimensional portals, insanely OP by all portrayals
Reality stone: Knowing about this doesn't change the outcome of Thanos using it, unless Thanos is directly attempting to turn him into cubes. Thanos can reality warp the entire battlefield, and Madara wouldn't perceive it as a genjutsu, because it is actually reality.
Based on
this video:
He can hide himself from reality
He can make attacks harmless/turn them into bubbles
Can transmute people (which appears to appear on the target instantly)
As for these Madara arguments:
"it wouldn't be out of his character to simply genjutsu gg Thanos before he uses the stone."
Don't recall rinnegan Madara ever using genjutsu
"Thanos doesn't go for reality warping off the bat where Madara does seem to enjoy using his limbo"
He set up an elaborate plan using the reality stone, one-shot multiple members of the GotG with it, and used it on the battle of Titan multiple times. He sure does.
Of course there's the other usual arguments, izanagi and limbo, one never happening with this edition of Madara, and the other being overrated as usual.
Don't see how Madara wins.
