The short answer is: I just like it! But if you feel like reading a bit more, the complete answer will be an amalgamation of the several ingredients.
Synthpop relies heavily on electronics and programming. In our age of the progressing personal disconnection it means that musician is still able to produce accomplished pieces of music basically on his/her own. Blame it on the untimely but quite expected demise of the brotherhood-in-rock lifestyle.
Hands down, mainstream pop music of the modern day is simply uninspiring. In its most generic form it sounds like a constant déjà vu. By and before 1985 synthpop was at the top of the charts. We’ll recycle it, add a couple of fancy bits (beats?) and brand it as electro clash for 2010. Then we’d sell it to the teenagers as something entirely fresh and unheard of. Today’s teenagers are far too young to remember eighties, right? 2015 minus 25 equals 1990 and now we can hear all that early techno/house flavour in the great deal of “contemporary” tracks. What would they call it this time, housetechnotronica or something? If it’s synthpop essentially, I’d call it synthpop and would not try to cheat listeners. Musicians are not corporate sales departments after all.
In my opinion the last true revolution in music production happened when microprocessors were integrated into the instruments and the studio gear. Later developments were quantitative not qualitative. You may increase the number of bits per second, shrink the size of the magic box, put a new beautiful logo on the faceplate or treat your average home PC as The DAW, nevertheless the basic principle remains the same. The then new technology gave way to the new means of making music and influenced the final result tremendously. The difference in sound production beween 1977 and 1983 is way more obvious than between 1989 and 1995 and onwards. It’s all about use of digital reverberation, samplers, analog synths under digital control and other gear unimaginable without microprocessors. Maybe because of that synthpop and in a wider sense new wave became the last genuine reinvention of the contemporary pop music. Sure, we witnessed a huge (though not entirely mainstream) rave movement in the first half of the nineties but the very fact that rave music was made mostly with the pawn shop synths and drum machines produced in the early eighties makes me feel a bit suspicious about originality of the genre. Nevertheless starting from Britpop we are continuously going in circles.
Hereby I officially declare synthpop the end of history and end of story.