Is there any good article about 2017 SegWit "softwork"? After taproot softwork, where majority were required to upgrade their nodes to avoid network split, I guess I need to unlearn many things that I knew.

Was the segwit really a softfork that didn't require majority to follow the network upgrade, or was it a hardfork, it just doesn't add up that such a modification as segregating signatures from the transaction data could be done without causing a network split.

And then, I accidentally saw some old tweets between Adam Back and Jihan Wu, where Adam was trying to coerce Jihan to upgrade into SegWit, why would he do that if SegWit was a "softfork" which doesn't require majority hashpower to successfully upgrade without a network split?