In hindsight, it does seem inevitable.  Graphically the SNES was so much better than the Gameboy.  But now I don't really care about graphical improvements anymore.  PS3 still looks really good to me.  Switch graphics are basically the same as PS4 graphics, I don't care what anyone says.  I doubt PS5 graphics will look significantly different either.

And when handhelds started using rechargeable batteries that was another big step, because now games could be longer.  There were a lot of little steps along the way, but now we are here at the culmination.  A dedicated home console is now mostly obsolete, not just for Nintendo, but for all of the companies.  I think that will become obvious a little after the PS5 and Scarlett release.