Yes it's good to practice, just pointing ATC tend to be more conservative on offering vectors to VFR traffic in zones or low near ground, traffic, airspace and weather (as James said it does happen en-route when you are flying VFR at 9000ft after 200nm, to avoid some airline TCAS going made, but again it's up to ATC, most would say if you made it that far on your own they won't get you lost on a vector), the vector given by the RHS instructor inside cockpit is well checked for traffic & clouds & terrain and hopefully airspace these days
Personally, I get lost after 3th vector and I need my iPad or Direct to runway on GPS
Back to OP question, for new GNSS approaches with FISO ATZ, Sywell for example, which I understand is flown on Basic Service (correct me if I am wrong as there is no reference in new Cap413 for RNP IAP RT but my guess it's not flown under ATC approach control in ATZ, or Procedural Service, or Radar Service), so my guess a PPL with no IMCr/IR can PPR to book one of the 6 slots per day and then go an fly it VFR? all 100% legit, after all he is entitled to receive Basic Service from FISOs and he can navigate and clear himself VFR inside the ATZ on that GPS approach (or even fly IFR in ATZ if he has an IMCr or IR)