Tank is about 3-4 weeks end from a DSM.
Plenty of other examples.
You can easily do a DSM using plain sand, but you need to spray or add ferts to the water you add to keep the roots moist.
There is no melting in transition, if so, why would this not also occur when you plant initially without doing the DSM???
This way, the plants have roots put down and only need to redo their leaves.
Also, bacteria and cycling are done and well in place.
If you start with a small amount of HC, you end up with 10X that much at the end of the DSM, so it cost less and is zero labor.
This said, if you have fish etc.........then the DSM is sort of out unless you can house them elsewhere, so then you need to go the traditional route.
As far as good CO2 etc.........this will save regardless of DSM..........whether the plants are pre grown in or not, algae and poor growth with bad use of CO2, DSM will not save you.
It's just used to start up a tank without having to do many water changes and work with little plant biomass. Can you do the traditional way? Sure, does that way take more labor and work and risk? Sure.
I do both.