The elephant in the room is monetary properties, not technical ones. It's very simple, for tier 1 monetary assets:

Good crypto = Public Blockchains
Bad Crypto = Obscrued Blockchains

For higher order tiers (backed money, e.g. Bitcoin CT), obscured blockchains are acceptable.

So you should therefore be discussing the merits of Good/Bad crypto within the domain of Public Blockchains explicitly or Good/Bad crypto within the domain of Obscured Blockchains explicitly since they are distinct monetary domains and obscured blockchains do not have any native (unbacked) monetary properties in the first place - even if it is "good crypto".