The throughput from a wireless dish is never going to come close to saturating 5e so it shouldn’t be an issue. It’s probably 1% of the capacity max?
Agreed. They would have to replace the existing wireless setup with a massive upgrade to come close to using up the bandwidth of 5e. When they do that, they can put in cat 6. Cat 5e is massive overkill on wireless itself. 6 is double massive overkill.
Quality cat5e cable is perfect for that application.