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 Sensitive information like what?  Like this pubkey came from this VPN exit IP? 
 yep, virtually at the same time. Time correlations tend to be VERY accurate.  
 Ah, so for multi account correlation.. you are gonna want to use a different VPN for each account then.. 
 yep, or a separate Tor session.  
 So it's a non concern. There is nothing additional an app can do, anyone concerned should already be concerned with the relays they are connected to anyway.. IMHO. 
 having a caching relay connected over Tor would help for untrusted clients, needs to have auth pass-through also

would also save bandwidth as well as increase privacy, with Tor or without, as it cuts out a lot of time correlation if you control the cache relay

this is why really all clients should have the capability to use at minimum a local cache relay for storage and optionally a remote one (for more privacy) 
 Something ISPs and governments have been doing for over a decade now. Some would argue makes TOR useless in it's current state too, considering the number of exit nodes that are owned by governments.