I feel (certainly in the long-standing thread in the protest sub-forum), that JSO's tactics have become a circular argument that is unlikely to move further. Practically all of us here agree about the severity of the climate change situation, and how much more fucked we are very likely all going to be within our lifetimes, never mind future generations. Some people think all actions are justified given the situation, others think some of those actions might not do much good or even be counterproductive.
Both sides of the argument have valid points IMO. But ultimately I myself feel that we're sadly well past the point whereby the mission statement aims of JSO would make any worthwhile difference to the planet even if they were met in full tomorrow. At this point it would be more sense IMO if JSO reintegrated with the wider XR movement. They can continue their high profile protests, which are never going to please everyone (and I myself think some of them genuinely are doing more harm than good from a public opinion angle), but at this point, campaigning for an end to new gas and oil licences in the UK seems about as useful a weapon as trying to put out a house fire with a 1L water spray bottle.