That's like saying that the advantage of DRM in media files is that consumers are forced to use it.

The only advantage for consumers I see for eSIMs is that they can be bought online and digitally delivered, so mild convenience, which is nice, but not quite as amazing or filling a great necessity as the OP tries to make it sound like.

Beyond that, well it creates new business models and is probably cheaper for mobile phone makers, which are advantages for others, but not for consumers since the barriers to entry in the mobile arena that make it prone to cartels aren't in the provision of SIMs, they're in things like radio spectrum licensing so eSIMs aren't going to cause a price revolution in that market.