Well an engine is an engine but as far as Unreal 4 goes Epic from the start has a proven track record of supporting the one man team on the same level as a AAA engine developer would support larger teams with out the addition of a support package fee. Every time we had an issue the solution has been to send off an e-mail that has always been answered in short order rather than our past experiences of having to constantly follow up or not get a response at all.
So as a one man development team your really not alone as Epic is invested and making investments with developer programs and resource sharing that are available to you in helping one to scale up towards the objective of releasing a game by providing options, resources, and their experiences of starting from zero at the wishful thinking stage.
Since stories of what has happened proves the point more than assumption our smallish team was in a position of having to switch engines due to obsolescence by design as well as lack of technical support by the engine developer and was in the process of evaluating different engines based on a longish list of requirements. We spend at least a good year going through the different options available off the shelf as to the average Joe and landed up doing a fair amount of proof of concept work with the UDK package and was impressed with the engines ability to mirror the game physics we were looking for.
This was at a time when it was rumored that Unreal 4 was on the horizon so like the other engine developers we sent off an e-mail making some general inquiries, as an engine swap is not a decision to make over beer and pizza, and unlike the other inquires a few days later I was on the phone with a gentleman from Epic’s licensing department, and “he” phoned me, and spent a good half hour talking about our project and our needs as to being a fit and worth waiting for UE4 to arrive that made the decision easier based on just Epic’s willingness to support their own engine with out the added support package most engine developers had demanded.
The point for the solo one man developer is not the engine but the willingness of the engine builder to help you get to where you want to go even if your starting from scratch with a pie in the sky dream of becoming a rock star.