Some people who complain about "shortcuts", don't realize that their issue is with another aspect of the game and not any kind of shortcut system whatsoever. For instance, many of the people complaining about shortcuts don't realize their issue is with either Input Leniency, Time Leniency, or Overlapping move-sets.

Input leniency: Any move in the same hemisphere will qualify for a directional input. So for example if you need to press back, you can use up-back, back, or down-back and any of those will qualify. So for example guile can do a sonic boom from down-back instead of back. Or a shoto can do a DP by doing ANY forward, ANY down, ANY forward. So you can get a DP from up-foward, down-back, up-forward.

Time Leniency:: The time window for inputs has been increased, so that the game will read the input buffer for a longer time than previous SF games. Which means you can perform moves slower than you would in previous games. As a result a direction you held from a previous move will get read in the buffer and will contribute to the move the game will think you are trying to perform. For example this is why you get a lot more walking forward into an hadouken turning into a DP in this game than previous SF titles, as you need to pause for a longer time frame.

Overlapping Move-Sets:When some characters (particularly the shotos) have many moves, like fireballs/supers/ultras/uppercuts etc which require similar directional motions its obvious that occasionally the wrong move will come out - even if the game did not have input leniency or time leniency. If for example with a shoto if there were a way you can specify in the game options that your fireball should now be qcb instead of qcf you would have a lot less unwanted moves happening, as less moves will now overlap.

Common Misconception: It is a common misconception that the game has specific input shortcuts built into it. For example many guides, players and even some pros will tell you that DF,DF, Punch is a shortcut for a DP. They are all wrong, no such "shortcut" exists. You can test this yourself, if you get a DP from that motion it means you accidentally hit an extra input (Down) when attempting the DF,DF and its the input leniency which gave you the DP. The Input Leniency in the game is often mistaken for built in shortcuts, which the game does not have per se.

Most of the people complaining about shortcuts don't realize that "shortcuts" are not the cause of their problems, but one of the above factors.