Lower latency was one of the *key* selling points of this technology.
satellites closer to Earth -> shorter slant distance -> lower round trip delays, shorter (undetectable?) pauses in conversations.
Key failures seem to have been.
1) Did not see how much the mobile phone market would grow with dramatic drops in tariffs, sizes and prices.
2) Too long to roll out so mobile phone had momentum.
3) Can work anywhere *except* in doors, so still need to carry 2 phones. WTF?
4) Serious over estimation of how many subscribers wanted/needed what is effectively *universal* roaming and prepared to pay for it.
5)Inmarsat had an *existing* service which they continued to refine, and had a solid brand already.
Note that most of these are not *technology* failures, they are marketing, management and economic failures.