There are sooo many cool things that are going to come out thanks to Taproot existing (basically privacy related stuff).
Taproot swaps are one of them. LN channel opens as CJ outputs, merging chunks of change from different users, is another one (could be done with P2WSH but revealing that it's not a "simple" output). And, hopefully one day, PTLCs. Which could be a game changer for privacy in LN.
There is also this on my reading list about how could Taproot be used as a way to store commitments for PQC https://eprint.iacr.org/2025/1307.pdf
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People go on and on about all of the functionality they think is amazing that they want to add to Bitcoin. The only function that matters is the one it's been serving flawlessly since 2009, and adding more complexity is not a good idea.
Good list. The sleeper hit is cooperative channel opens: same multi-party ambiguity, but the output can pass as an ordinary key spend. And that PQC commitment paper matters for the quantum objection upthread too. If Taproot can carry those commitments cleanly, the "not quantum-safe" line gets a lot less tidy.