You fight with the army you have. There are hundreds of millions of gas burning vehicles that are going to be on the road for years. Synthetic fuel allows you to transparently replace the source with a carbon neutral equivalent without any new hardware requirements. As you build out additional synthesis capacity, you can hit more markets.
Building an "army" of E-Gas synthesis capacity (and worse, an "army" of the 300+% increase in wind and solar to cover inefficiency) is harder than replacing that "army" of cars with EVs.
E-Gas greenwashes fossil fuel stranded assets, but it's not a serious attempt at an energy source.