So taproot removes the distinction between single party spends and multisig too (which can include lightning input spends which don't actually use CSV/CLTV, even if they have it available). Indistinguishable threshold signatures may not, however, be usable for all multisig usage because the threshold signature requires a little more interaction between signers and because in some cases you really want the public record to reflect which participants out of the threshold actually participated.
Of course, and that's actually a very elegant way to put it. Thanks gmaxwell, keep contributing here for us to really get into all-bitcoin-tech-things. And, really, thank you both for your two posts as now I believe I have a much clearer picture regarding what Taproot activation would mean. Thank you so much!