Before esims you would have to go and get a physical SIM from somewhere. I've done it before. It's possible, but it was much more of a pain than esims.
The only issue with them I've found is that they're delivered by QR code via email, and the only way to install them on Android (that works) is scanning a QR code with your camera. I had do ask someone to take a photo of my phone so I could scan that photo. facepalm
Someone in the comments linked to actual benchmark[0] and it looks like it ~30% faster in most cases...
[0] https://www.computerbase.de/2024-01/amd-ryzen-8700g-8600g-te...