I wouldn't call Fischer-Tropsch a "high temperature" process at least compared to other processes that run at an oil refinery. A big problem with it (unless you're making methane) is that high temperatures break hydrocarbons down.

Low temperature processes run at a low rate so you have a huge machine and large quantities of catalysts tied up to make just a trickle of fuel.

Nice to see the F-T process bypassed because the high capital cost makes it the last refuge of the desperate.