I absolutely loathe the term "snowflake". And blanket terms to describe a whole group of people are inaccurate.
Like any other generation, there will be some DC who grow up resilient and independent, and others who need a bit more time.
I agree though that children are capable of doing a lot more than we think and DC and teens need to be given responsibility in order to mature and there is little opportunity to do that in this day and age the way our society is framed. In other societies children are responsible for younger DC and animals at quite a young age.
I know five, six and seven year olds who, having been taught properly, can lead a pony out of its stable, brush it down, pick out its feet, feed and water it, groom it, hose down its legs, tack it up and ride by themselves quite happily and to a high standard (with supervision at a distance) but not all children get the opportunity to do that or something equivalent.
There doesn't appear to be a lot of down time nowadays where children can just "be" as a lot of extra-curricular and social interaction stuff is highly scheduled, whereas my siblings and I drifted about during the summer in a very relaxed way and were able to have fun and be on our own to a large extent.
Also, there is a lot more pressure on our teens than there was in my generation. My teens have had much more rigorous schooling than me, they have been constantly tested and assessed, there is pressure for them to stay in education in order to get a good job, a lot of pressure around exam results, a lot of pressure around appearance and being "perfect" (I have teen girls) that comes from social media, about how to live, eat, exercise, organise yourself, which we were able to avoid - mostly anyway - and a lot of pressure stemming from the fact that if you make a mistake, fall over, cry, do something silly, someone is there taking a photo or filming, or posting about it on-line, so the challenges are different but that doesn't mean they are not there.