You're right, a fictional conflict doesn't bother me. Of course most scenarios in DCS are going to be fictional. My point is that the Viggen doesn't fit in any theater of conflict outside of Northern Europe, where other jets are more versatile. Can the F-14 fly in Northern Europe cold war scenario? Yes. Straight of Hormuz? Yes. Georgia? Yes, even though it was retired during the time period it's still plausible.
Now, if you like the Viggen all of that doesn't matter. You would fly it anywhere because you just like the jet and want to enjoy the chance to fly it. It is possible I could end up purchasing the Viggen because I desperately want a high speed strike jet in DCS like everyone else. I own A-10C but I could never get into it. The A-10 is just so SLOW it drives be nuts.
Even though I'm personally disappointed in the Viggen choice by LNS I'm still happy its being developed. It just shows the variety of air frames we are getting in DCS. There's something for everyone.
The only thing that confounds me is the fact that no 3rd party developer has taken up development of the F-16 yet. It's probably the single best modern jet to model in a combat flight sim. Arguably the most successful multirole fighter ever built, flown by over 25 nations worldwide, the list goes on and on.