I tried using a work eSIM as a secondary SIM to my personal physical SIM on my iPhone in 2022 or 2023. I was taken aback by how poor the experience was, both on the iOS level and the eSIM technology level. At that time I reckoned it's probably like 10 years too early and I don't think I will be giving an eSIM (primary or secondary) a shot sooner than in the 2030s.