If you want reliable, strong dual band WiFi then best to invest in a top of the line router like the link below. To expect an ISP to provide something that costs $200 plus in a single box solution isn't realeastic. Customers would then complain about the higher lease/purchase cost. Kind if a no win for HughesNet. They provide a basic modem/router solution like most ISP's.
What I'm presently using on Gen4 in 1500 sqaure foot wood frame home and works great both bands: https://www.amazon.com/RT-N66R-Dual-Band-Wireless-N900-Gigabit-802-11a/dp/B00EYKSJ1E
PS Edit: I have 3 dual band routers models I experiment with. This one seems the most solid, at least on Gen 4 and my particular house configuration. That is another big factor. Can't expect an ISP provided router to work well in a 3000+ square foot, three story home.
Oh, third party Merlin firmware on my router BTW.
At the request of @Amanda, I have created a new thread about the Gen5 issues I'm seeing: