Well we can at least be sure that Focus know everyones opinions on the subject
Regardless of this, we have to bear in mind that the game that was originally released for PC is not the game that exists or people want today.
Each and every hardware platform has it's peculiarities, not just with performance, but more critically, with deployment architecture.
I can created a piece of code with an open API and tell the world to help themselves. Anyone with an internet connection can create and upload any kind of content, licensed or unlicensed, and make it available to anyone else with an internet connection. That's your PC modding scenario.
Now try and release that same piece of code onto hardware and a software delivery platform owned by Microsoft, Sony or Nintendo. Do I really need to say more?
If I do, consider that now that content needs to be managed, reviewed, approved, (possibly) licensed (requiring in further review and approval from the owner, hence no Jeeps unless Jeep want Jeeps), paid for (yes licensing costs money for which there is no guarantee of return on investment), submitted, deployed, etc. And this process is likely different for each platform.
So yes, modding 'may be' technically feasible. This isn't the issue.
The issue is that the reality of implementing modding capability is at the very least, not something that was considered for a multi platform deployment in the original code base and will need to be totally rethought and designed. Even then, the scope of what can and can't be achieved in modding is likely constrained by what the platform owners allow or require and even the smallest amount of work would result in a management resource overhead that the game developer may not consider provides an adequate return on investment to make it worthwhile.
I would like to see an effort go into the availability of extensibility for community created maps (using original textures and models) and challenges, but would be able to understand if the availability of vehicles or custom textures would need to go through a review process before being made available for download (i.e. Focus can't allow Jeeps to be available if Jeep don't allow Jeeps to be available. Similarly a beautiful custom created Coke sign on the side of a garage in a map may not be accepted by Coke and therefore Sony/Microsoft, regardless of whether or not it makes the game more fun for us.