True, but the intervening space between LEO and HEO can be covered by flying debris in under an hour...heh heh.
Seriously, it's not the satellites in HEO I worry about, but the fact that they eventually fail or otherwise go out of service. If a thin layer of debris exists between the surface of the Earth and that altitude, for lack of a better term, and the debris is randomly moving at 10X bullet speed, the problem becomes "how do you fly a great big rocket full of rocket fuel through that to reach high orbit?"
The situation is analogous to motoring through the Great Pacific Gyre without trapping a plastic bag against your raw water intake. The ocean is very big, but the plastic bits and pieces in the water column are numerous and randomizes once inside the gyre.
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