Q is a superior technology
Not true. 4K HDR is only available on the main box, not minis so being able to watch 4K in another room is not possible. The biggest differences is the recording, but with catch up being as good as it is, it only really applies to recording the odd channels not on catch up.
also, the mesh technology used is absolute garbage to the point we unplugged the minis 6 months into an 18 month contract and went to freeview/now whilst the contract ran down. No amount of messing about with network settings, home plugs, drilling holes to run CAT6 worked.
Stream hasn't been without its issues, but that's mainly down to broken remotes, flakey hardware and firmware bugs. Most of which have now been resolved, so it's pretty good albeit not perfect (it's expensive, but that's sky for you). Personally I'd have preferred a sky app instead of having the box just for streaming, like Now TV but with all the channels.
Granted, if you are a large family with crap internet it might be a different story.
That said, if I was single and living on my own I'd cancel the lot......I despise sky, but I am outnumbered so reluctantly paying £70 a month for everything. The only saving grace is the family&friends subscription sharing, so I share with two other households and share the cost. Considering you get Netflix/Paramount/Discovery it's a pill I can just about swallow.
I've even tried plex/wintv/hdhomerun/aura solutions but it's just not as slick.