Sqad,
It might have been true 25 years ago that full Sky would get you everything, but not now.
Rugby Union screening rights are split between SKY, BT Amazon and S4C. The same with other Spirts.
I currently run my television watching from my iPad.
I have NowTV App (so I can buy games I want to watch), Amazon, Netflix, ITV Hub, 4OD and iPlayer. All have live and streaming, and I can cast everything to my TVs.