2182 is still the standard hailing and distress frequency in the HF band. HF has much greater range than VHF. Satellite emergency beacons, EPIRBs and PLBs, are excellent for sending a distress signal when things go bad fast. They also help rescuers find you. But it is not practicable to make detailed communications about an emergency, such as one below that of a “MAYDAY”.
A “PAN-PAN” message, such as having someone on board with a medical emergency wouldn’t be something that you’d want to activate an EPIRB for if the rest of the ship and crew were not endangered.
The other problem with satellite is that other vessels in the area won’t hear it. A broadcast on HF at 2182 and on VHF 16 (or now with DSC, 70) can be heard by other vessels which may be in a much closer position to respond and assist than shore-based rescuers.