Have you programmed in scratch for any significant amount of time? I have, so have my kids, and as a CS prof (at a small non-engineering college) I encourage my students to do so too. Before age 10, almost entirely on their own, my kids discovered ideas like abstraction (writing custom blocks), recursion, data representation (e.g. encoding/decoding pairs, structs and lists into arbitrary-precision integers), asynchronous vs. synchronous functions, performance tuning, 3d perspective graphics, and race conditions. At bedtime it's not unusual for them to ask about, say, what happens if you do recursion without a base case, or wonder whether you could simulate the scratch language within scratch itself.
All of these things are fundamental CS concepts, and they seem to grasp these at a much deeper level than I did at that age, and better than most of my college students. Yes, they also do some python, html/css, a little java, a bit of javascript. And those all have their place, and they like making websites. But the scratch infrastructure is fantastic. Good learning curve. Just enough language power to do amazing things (threads, fork, async notifications, custom blocks, cloud variables for multiplayer online). Instant publishing. Great community. Fantastic programmers (hi Griffpatch!) putting out incredibly clever programs to admire.
So all this is to say that it is unfair to dismiss scratch as "a cat walks towards a barn".