This statement reeks of lack of practical experience, OR a protectionist attitude towards professional gear.
The simple fact is, a good photographer can work within the tools given to them through creative thinking and application. And there's a huge difference between having to compromise over a shot that can't be taken the way you intended, and not being able to take the shot at all.
This isn't to say that photographers should entirely ditch their dSLRs. I use my Canon dSLR when I can, and enjoy the superior optics and features. Clearly I can do more with it, when I have it with me. But therein lies the problem: I CAN'T always have it with me. And my iPhone with its camera is with me a lot more often than the dSLR.
They've moved on for a reason: practically, no, film is NOT more forgiving than a digital sensor. Film brings permanence, requires patience to see the results, and is consumable. That demands either lots of experience and skill to take the shot just right the first time, or lots of money to account for the lots of bad shots you'll have to discard to get the one good shot.
With film, the estimated
880 BILLION photos posted every year (and uncounted deleted ones) would simply not be possible: it would be too expensive to buy all that film, and take too long to process.
With digital, the barrier to entry has been lowered such that people who wouldn't have dreamed of trying photography now do it every day, as a regular part of their lives. And if you don't like the shot you took, you delete it and try again, and it costs practically nothing but time and a tiny bit of electrical energy to do this. That's about as forgiving as it gets.
I for one, would like to see examples of shots taken from your 4MP Canon, and your iPhone 6.
So they look like this? Or,
even like this?