Summary of my initial thoughts on Lens v2 (Bonsai):
https://autumn-provelone-3d8.notion.site/Thoughts-on-Lens-v2-Bonsai-c75176e2e1b043d18141da5d84fd8f84

Fc is on other end of spectrum, so different challenges. But from that list I would say app signatures. Provides trustworthy way of verifying that a message came from trusted client, which is helpful for mitigating spam and filtering out messages from malicious or low quality clients.

If there was one thing about either the implementation or your proposed changes here that could improve Farcaster, what would it be?

Technowatermelon. Elder Millenial. Building Farcaster. 

nf.td/varun

Same as in v1 actually. It accepts content uri similar to ERC721s. IPFS /Arweave most common

where is actual text content stored in v2?