It's been implemented, you can setup these kinds of escrows just using bitcoin core and have been able to for years. It's just another application of multisignature, which is what P2SH was created to make it easy to pay into without special software support.
There have been commercial services based on making these kinds of transactions-- e.g. Bitrated.
The reality is that the demand for it in practice is pretty negligible. The issue is that if people think the transaction is at risk they just don't trade. If they think it is not at risk then they don't bother taking actions to secure it.
It's not supremely user friendly to do these kind of multiparty transactions in bitcoin core but that itself is just a product of demand.
As far as Wright goes, he mostly speaks in vague truisms specifically to avoid getting caught out. So for example Satoshi says that he didn't have time to implement it-- Wright says in there since day 1. But if you try to nail wright to a cross on this he'll just say that he meant the potential was in there as part of the design.
GMax, thank you!!!
For what it’s worth, you more than have “done your part” (and then some)…Referring to when you were brought up in that worthless btc doc HBO released “recently”. Over the years you’ve been extremely helpful and engaging w/me personally and it means more than I could ever express. You’re a true freedom fighter and stand for righteousness above all..thank you, for everything. Fuck the haters/trolls.
I enjoy your photography btw. Clearly a fellow plant/animal lover.
Cheers.