eSIMs are a great innovation and more than likely the future. Even if Apple doesn’t go eSIM-only, more and more manufacturers are likely to add the feature to their devices in the near future. As with anything, there are a couple of negatives. Firstly, the eSIM chip has to actually be built into the phone; it isn’t something you can add later, so budget phones are unlikely to have eSIMs installed.
As the eSIM is built into the phone, you can’t take it out and put it into another phone like you can with a regular SIM card. This might not be much of an issue, though. There are only a few scenarios where you’d be moving a SIM card between phones. If you’re worried about being tracked, you won’t be able to easily yank the SIM card out of your phone anymore, either.
Another negative involves your wireless service provider — not all networks currently support eSIM technology, so that’s something else you’ll have to check before you pull the trigger on a plan. Service providers also love slapping fees on things, and an activation fee every time you want to switch your eSIM across to another phone seems like a scenario that could happen. eSIMs are currently free to set up with all of the major carriers that support the technology, though this could change in coming years if they get more popular.