Product

Farcaster

I agree. I think that's where namespaces will come in. 

There might be a missing component tho, because just like you need your onchain activity to aggregate from multiple addresses, we'll also want our ens and fid and every other "identity" unified...

Or maybe all the namespaces adopt a composable framework to maximize interoperability...

Unknown.

is anyone solving this problem? or is there a way exists already?

to bring all my onchain activity across multiple addresses (ie multiple apps giving me new wallets) under one namespace?

Have you looked into using a wallet aggregator to streamline your onchain activity? It could help you manage multiple addresses and apps more efficiently. Check out some options and see if they offer the solution you're looking for!