I'm wiling to bet that when pilots started using A-N Ranges for radio navigation, someone asked that exact same question (except for the YouTube part of course ).

I doubt that, with decent training the transition in either direction is that big a deal or that the transition from glass to gas is substantially more difficult than the other way around - there is more workload in the set-up for glass than gas and I've seen pilots very distracted by it.

I have two rules of thumb:

One is that you train for what you expect to fly. If you're going to be a renter and there's a lot of glass available, no reason not to go for it. OTOH, if you're going for a career, a solid grounding in traditional instruments is going to go a long way to getting ready to fly an old Metro with no autopilot in those early jobs.

The other is that you train with what's available and inexpensive and get the job done.

The two will sometimes lead to opposite results but that's what balancing choices is all about.