Perfectly safe in respect of the US way (which I was defending as being not too disimilar to the UK) and also the UK.
In VFR (and thus VMC) you can see the ground. Using an aid does not prevent that. Legally whether you can use an aid which no one can check up on whether you did or not is another issue. I think that is the same for the USA and the UK (by inference).
In IFR, the US requires you have a clearance from someone. I don't know their rules well enough to say if there is a VMC differential whilst under IFR.
In the UK, under IFR you need an ATC clearance, except in the specific occasions mentioned in the ANO. These conditions are when you are flying in IFR and then switch to VFR (and thus VMC) or when you can fly in uninterrupted VMC (remaining IFR) in CAS. Again, using an aid does not prevent you seeing the ground.
So both are perfectly safe systems in my opinion.
IFR and IMC in UK = No go without ATC clearance. Only available from airfield ATSU.
IFR and VMC in UK = OK, if you are in CAS, or cancel IFR plan.
VFR and VMC in UK = OK at all times.