And yet, you'll notice the solution is always "run so fast everything blurs, and that magically fixes everything."
Aren't you forgetting that the Quicksilver sequences in the past two
X-Men movies were the most visually impressive, creative, and critically acclaimed sequences in those movies? Heck, the Quicksilver sequence in
Apocalypse was the only part most people seemed to like. There are all sorts of visually impressive and creative things you can do with the concept of superspeed or accelerated time perception.
Seriously. Of course they could throw more stuff at the screen with more money. But if the solution always remains "run at blur speed", then I see no compelling reason why us fans of the show should shell out for a movie version of the more of the same, only somewhat bigger.
Have you actually watched the show, or read any Flash comics? Writers and artists have been coming up with countless variations on the Flash's powers for the past 60 years -- 76 years if you count Jay Garrick. There's so much more to it than just running fast. As with Quicksilver, there's
thinking really fast, being able to accelerate his perceptions or speed-learn or even resist mind control by outracing it with his thoughts. And there's his vast range of other physical abilities: running up vertical walls, creating air vortices, phasing through solid objects, becoming intangible, moving fast enough to appear to be in multiple places at once, harnessing and throwing his "speed lightning," magnetic manipulation of metal (as an extension of his "lightning" abilities), and of course the big ones, traveling between dimensions and traveling through time. I mean, come on, man, the Flash can
time travel under his own power! That's become almost as central a part of the Flash narrative as the "run really fast" stuff. I'd be surprised if the Flash movie didn't make some use of time travel or parallel Earths.
One of the main criticisms of earlier screen portrayals of the Flash, in fact -- e.g. the 1990 series or the animated
Justice League -- was that they tended to tone down his powers too much, downplaying how incredibly powerful someone with unlimited superspeed would actually be, and overlooking the other powers he's been given in the comics. There's very little that the Flash can't do.