Agree it's very very tiresome!
For basic health and safety reasons I believe that licensed tourist rentals should have some kind of back-up power source.
They should also be required to provide alternate lighting (some big bright flashlights) communications and information to the guest on what to do, who to call, what to expect.
Most hotels elsewhere have emergency lights that go on the minute the power fails --- do we have anything at all akin to that? Might want to think of that.
Even with our new power lines and all that, we're probably going to face more outages not less. Mexico supplies our power and they have plenty of new rooms and resorts eager to use it. Tulum is a bustling tourist destination. It does not have power "yet". Electrification is planned, and when they get it I think we'll suffer a significant loss of available juice.