> whereas 5G in the future could provide up to 10Gbit/s
"Could" is the catchword here: It could, but most likely wont in the vast majority of places, simply because you can legally claim "5G coverage" with about any bandwidth. Just say the magic word "up to".
(Besides, slowing it down allows you to speed it up a couple years later and sell it as "5G+", in an attempt to delay as long as commercially possible having to invest in 6G.)