Airlines will meet a passenger with a wheelchair at the terminal entrance and take them to the gate. That service is genuinely good, and it starts at a kerb the traveller still has to reach.
For an older or mobility-limited traveller, that first stage is the difficult one: luggage, a long-term parking shuttle, a walk from an economy lot, a rideshare driver who will not lift a case.
Jomia covers the gap. Collection from the home, luggage handled, drop-off at the correct terminal door, and a handover to airline assistance where that has been arranged.