The paperwork problem an eSIM solves
India requires identity verification for mobile connections. For residents that means Aadhaar; for visitors it means passport, visa, photographs, a local address and a verification process that can take anything from an hour to a couple of days depending on where you try it.
Travellers routinely arrive expecting to buy a SIM at the airport and find the process slower and more document-heavy than anticipated. Some airport counters handle it efficiently; many do not.
A travel eSIM sidesteps this entirely. The profile is issued against your purchase rather than against an Indian identity check, so there is nothing to present on arrival and nothing to wait for. For a short trip this is often the single strongest argument for using one in India.