Television uses motion blur to make it look smoother. Computers don't use this so you need a few fps more to make it look smooth. Of course there's not much need for excessive fps. That just robs the computer of resources it could use for something else like crisper textures. I'm perfectly happy with my sim locked at 25fps. Textures load faster and even in lower frame rate areas it seems smoother even if the fps isn't perfect. Smoothness isn't always defined by the fps number.
the best thing FSX has its realistic flight dinamics ,otherwise I would unistaled fsx already..
I don't usually fly the default airplanes so I didn't notice any improvements in the flight dynamics except for the helicopters which have improved a lot from Fs9 to FSX. For the fixed wing airplanes even in Fs9, a well tweaked air file gives more than decent flight dynamics. I did uninstall FSX but not for the fps. Those were slow but acceptable. I uninstalled because FSX took a dump with the "1733" or whatever error and wiped out my Fs9 installation along with it. >:(