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The older ways work fine, and there are a lot of tutorials about them! I think there is a lot of advice on this but people like to say you may need to feel the pain in order to know why you would use the new thing. I don't think it matters that much: if you think it's too complicated to do something new, stick with what works. Chasing the new thing is tiring, unless using it is actually helpful enough?

Not everyone "has" to use the latest syntax or Babel

There's nothing wrong with using new standardized (as in, accepted and official JS syntax and runtime code). The ones you list are prefect examples of official code. Promises are everywhere, and essential to understanding async in JS. Awaits are well on there way to becoming best practice (and mandatory) learning, too.

But be careful with "experimental" codes that are not fully standardized (still in the proposal process, per the TC39).