Just saying, people can do well at Smash without being good at footsies because footsies play a far, far smaller part in Smash than they do in Street Fighter. In Smash you can run, roll, jump at different heights, control your falling speed, mid-air jump into any direction sometimes several times, move more or less freely while in the air, airdodge and generally dance around the opponent any way you want whether you do it aerially or on the ground. There's always a ton of options the players have simply because of movement, whereas in Street Fighter there's few enough that you can actually completely focus on something like footsies and reaction to a select few approaches or buttons. Mobility is the central factor in Smash, not footsies, and it makes precise spacing much harder and more impractical than SF's back and forth walking does. In Smash, you should first consider movement and mix ups, then work on precise spacing much later along the line.
It's very largely the same with Smash 4 Ryu except you can remove the "move more or less freely while in the air" part, yet only that one. He has more attacks than other characters, but ZSS also generally utilizes more attacks than Falcon and still no one keeps emphasizing the difference in their difficulty levels, or between Sheik and Mario, or Pikachu and Luigi. What comes to his inputs, they do leave more room for error than other inputs in Smash, but they're still very simple.
I also disagree with any notions that Smash 4 is an easy fighting game. In addition to its fast pace (despite a few matchups out of 3000+ being sluggish) and the options you have to mix up between and consider from the opponent at all times, you also need to have some pretty immense knowledge with certain characters about when their setups and combos work on different characters, now factoring in rage as well. What's really nice is that when you get a rough idea of all the variables like fall speed, weight, size and rage, you sort of create a formula in your head instead of having to individually test your stuff on every character to know roughly when it works. Then there's also DI mixups and sometimes the requirement to react to it, spacing between sweetspots and sourspots to get exactly what you want and so on. A professional SF4 player would take a considerable amount of time to get actually good at Smash 4, or possibly not get there at all because it's a vastly different kind of game. Same vice-versa of course.