> Unless you are specifically targeting low-bandwidth users
There aren't some tiny number of low bandwidth users with some esoteric internet problem, there is a significant divide due to technological and geographic reasons. Averages are very misleading when the majority of people in cities connected to various fiber end points keep getting crazier and crazier speeds while 50% of the US is stuck on ADSL, with a theoretical max of 20Mbit down - add geographical limitations and that's often far lower due to line noise. Where I live in the UK it's also just a matter of luck, I live in the middle of a major city and yet in the 5 places I've lived over the last 10 years the only option was ADSL, and never >6Mbit.
I haven't even started the argument about other countries with poorer internet infrastructure.
When you assume being able to download at 1MiB/s is basic, you make the internet suck for a huge chunk of the population, they are not the majority - but barely.