It is indeed a matter of priorities. But you also need to throw in a dash of truth about where things have gotten to, after S397 took over from ISI.
S397 diagnosed the issues with the software when they took over. They believed there was a fundamentally sound sim product, but it was being held back from achieving its potential because of various factors. Most people here have an opinion that the basic physics/FFB was good to great; so leave that be, and improve the stuff around it. First priority they identified was move from a very dated look to the graphics, which necessitated a move from DX9 to DX11. This they have achieved. And with the latest build, they have largely resolved the performance issues that came with this and we've got much improved quality. They also added VR, something which is especially advantageous in the sim racing niche. Are both areas in need of more improvements? Certainly. VR performance and triple-screen performance, and lock-to-horizon in VR are things I see mentioned. But, S397 clearly worked on that area which was most in need of improvement.
The second area most mentioned was with content. Whilst some liked what was available, and there was certainly a wide variety, many felt that this too was lacking in quality. They've hardly gone crazy with DLC unlike some other titles; a GT3 pack, a Formula E pack, and a Karting pack in 18 months (not made by the core team). Compare that output to AC, or the increases in content with titles like PC2 or iRacing, you'll find it somewhat competitive. And we all know and understand (though some refuse to accept) that in order to stay in business, S397 needs revenue, and this is the path they have chosen to get it. Now, you could make an argument that the other area needing improvement was that of content made by modders; S397 have made some progress with dev documentation and some minor updates to tools; and its a matter of opinion if this is enough at this point and is driving better modder engagement and new content. The main one I've seen at this stage is Enduracers mod, which includes most of the newest features. There's always going to be a lag time between producing documentation and actually seeing new content.
Which brings us to two areas that arguably are in need of work. First, are all other aspects of the sim other than graphics. And its true that little obvious progress has been made here, and at this point, it needs to come up the priority list. Second, is the UI. Now, making changes and adding features/functions even to offline play, are going to also probably need changes to the UI to support them. One of the big complaints of rF2 is the need to fiddle with files and settings within files in order to get the result you want: and most people likely don't want to keep doing this level of 'hacking'. Few other sims require the level of tweaking that rF2 does. But this is all now queued up and has to wait for the release of the UI 'framework'. It's quite clearly the critical development item, nothing eclipses it in terms of priority. Once they have the basics of this rolled out, they can probably then turn their attention to all the other pieces that need fixing or improving. They've clearly had major issues with this area: and until they solve this, and in much the same way as they needed to solve the performance issues, there's not much point throwing out new ideas and areas in the Roadmap, because they aren't going to get realized in any short timeframe. With one exception: new content. So it cannot be a surprise that the Roadmap has largely talked about new content. But it probably is time for a Roadmap that explains what other areas of the sim are going to get fixed in some sort of priority order. S397 don't need telling that the UI is holding up everything else; and us beating them up for it isn't going to get it here any faster at this stage. They are right, its basically a matter of grinding it out.