Global eSIMs are genuinely handy if you're hopping between countries, because you land with data already working and skip the airport SIM counter entirely. For a multi-country trip, having one plan that covers the whole region saves a lot of hassle at each border.
The trade-off is price and features. Per-GB costs on travel eSIMs are usually higher than a local prepaid SIM, and many of these plans are data-only, so you don't get a local phone number for things like ride-hailing apps or restaurant bookings. Some countries also have patchy eSIM support or route traffic through foreign servers, which can slow things down.
A common setup that works well: install a small travel eSIM before departure so you're connected on arrival, then buy a proper local SIM or eSIM once you're settled if you're staying more than a week. Check first that your phone is unlocked and actually supports eSIM, and that the destination country allows eSIM activation for visitors.