Segregated Witness is just another way to centralize mining. I will explain that in the future when I am ready.
... but that is a small price to pay in order to
- Malleability Fixes
- Linear scaling of sighash operations
- Signing of input values
- Increased security for multisig via pay-to-script-hash (P2SH)
- Script versioning
- Reducing UTXO growth
- Compact fraud proofs
ftfy
The technically-challenged will conflate features with don't require Segregated Witness with an argument for why we need Segregated Witness.
Give them respect at your own peril. I rather enjoy the humor of it though.