There are many prior threads to this topic, you might check there, however, I've found no need for ADA PS.
It's mostly a source of NO3 at the initial stage.
It gets mixed up if you uproot with the aqua soil and are not careful, then looks tacky(while large pumice + blackish aqua soil).
I've long used ADA AS alone and have excellent results.
Some have claimed the PS helps prevent anaerobic conditions, this is not true either. Plant roots add their own O2, this is well known, studied and understood by anyone that's ever bothered to study wetland and aquatic plants. Same thing with heater cable arguments.
As far as adding a long term source of extra nutrients, osmocoat is pretty darn cheap. I don't bother, ADA As has the lion's share of the nutrients anyway and leaches a great deal in the first 1-2 months anyway.
As far as the ADA look, no, not ever remotely close to being required.
Aquascaping and a method are independent of each other. Always has been.