RAR is a great tool but has a big startup in comparison to other movement options, so I would be careful to use it against non-conditioned opponents/ opponent not limited in their options. It has use for edgeguarding, and I can think of many desync scenarios where it is possible. Also a rar nair might be possible while retreating to catch high-speed low-range approaches.
Nana Ice Block -> RAR approach (now it is safe)
Same with Nanapult (Nana jump (forward)->blizzard)
Nana covers the startup passively (by being able to hit an attacker in theory), dashes forward during the RAR, covers the cooldown activley by attacking or grabbing
I think IC players should give more priority in being able to input what they want with both characters, sometimes it is really hard but there are missed possibilities everywhere.
I try to think of it as "non-interfering frames" where your action only affects one climber. The problem why players are cautious to use desyncs is that uding those frames is very hard.
Usable frames are every active move, jump startups, hitlag, landing lag, WD landing lag. Some inputs aren't even that bad if they interefere (if you buffer a side direction or something).
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Hinichii.ez.™
Don't be so pessimistic
But I'd love to see some great IC play too.