A:Answer As long as the internet connection is stable, 10Mb is more than enough to look good. Most 1080p content is like 3-8ish Mb for streaming (and all streaming services lower the bitrate and resolution if they need to). Most 4K streaming content needs like 11ish-15Mb, but again if it doesn’t get that it’ll just degrade to 1080p and still look great. (AppleTV+, Apple’s new streaming service is apparently the highest bitrate service, going as high as 60Mb/s apparently, but again works fine on much much less).
I used to have a 6Mb service and streaming looked good/worked fine, and would be at 720p or 1080p. I’ve even streamed stuff at 1Mb/s, though that looked rough, worse than NTSC broadcasts, though even that wasn’t totally unusable.