Android did it without complaining, iOS apparently does it. My SIM is still the same that I got in 2001. It's a pretty convenient location to store that stuff.

You do understand that very few people still have a 14 year old SIM. Does that even support 3G?

To be completely honest, I was unaware the modern smartphones could save contacts to SIM rather than internal contacts db(I quickly looked at my phone and failed to find an option to save-to-SIM).

This is a very very edge case that most people will never use, so lack of support for it is quite acceptable. Mainstream features are what Ubuntu is probably targeting right now.

there is few of us who have contacts managed in this way...