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It takes more for them to do high-split...

Many customers have equipment that relies on a downstream out-of-band signal, which cannot be moved past 130 MHz (per the spec). High-split destroys that signal (without some kind of workaround).

There is the issue about signal leakage in the aeronautical band. FCC will punish them, if they don't have this under control. This band is now in the upstream path, so new methods to detect leaks much be developed.

There can be an issue with interference between neighbours (not the biggest issue, but it exists and must be addressed).

Comcast says high-split will come to select areas.

Everywhere else it seems it will be mid-split and then a migration to FDX.