Unless there's some significant transaction compression. Taproot allows for collaborative and privacy-enhancing transaction setups. Multiple users can sign a transaction and have their signatures combined into one, more compact. That, and the merging of multiple spending conditions into one, can greatly improve scalability. I can imagine a second layer solution, where 1000 users broadcast one Taproot transaction to open, e.g., 1000 lightning channels.

(That example probably won't work with the current lightning software, but it's technically possible)