The challenge to standard geochronology is that if mountains have been uplifting at current rates or even much slower, the lower parts of the geologic column which are many hundreds to thousands of millions of years old should have been uplifted and eroded away long ago. Yet these older sections are very well-represented in our mountain ranges, as cursory field study or examination of geologic maps will reveal.
I've seen that. I suspect some of your YECish don't like it because there are then no mountains for the rising flood to cover, which makes it un-literal. That's obviously not my objection, so I'll mention it only in passing.
All the mountains on Earth should be about the same age by your model, which is basically younger than springtime. Younger, that is, than even the youngest mountains we have, the still-growing Himalayas. There should be no old, rounded mountains like my Appalachians, which are among the world's oldest. You can't find a dinosaur bone where I live. The mountains were raised and eroding away when the dinosaurs were here, so all the dinosaurs that ever died here--and there figure to have been plenty--washed away downhill.
Nothing here post-dates a thing called the "Alleghenian Orogeny," the tectonic disturbance that crumpled the once-flat sediments into mountains. It was a collision with what is now North Africa which put the last piece in place to form the global continent Pangaea.
In the Himalayas, you can find fossils of mammals from as little as 50 million years ago, their bones preserved from the sediments along the shores of what was then the Tethys Sea which separated Southern Asia from the approaching sub-continent of India. Here, you can find a trilobite if you're lucky, but you have no hope of ever seeing a mammal or a dinosaur. Maybe an early synapsid reptile is possible.
If you're using a Walt Brown-type model for post-flood continental drift, the energies involved would have melted the crust. Even at lesser speeds, the catastrophes involved would have merited as much ink in Genesis as the flood itself rather than being unmentioned.
Clearly, nothing like that ever happened.