[siliconhippy]

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@siliconhippy 
I'm not sure what you are asking. 
Dash is required for live streams in Kodi < 18. 
HLS live streams honor the quality settings in the add-on.
Adjusting based on network conditions is a future feature for inpustream.adaptive, I don't believe it has been implemented yet.
If you're wanting to resolve streams yourself by using tools like youtube-dl, there is also youtube_resolver.py included in the add-on to resolve links and you can choose the stream you want.
I have no experience with Dailymotion or Vimeo so I couldn't say.
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@anxdpanic

1. So you are saying that if I just copy the YouTube live TV URLs as displayed into a m3u list, this will run fine in a Kodi player like IPTV Simple Client?

2. What is the latest update from Addons for Kodi 17.6?
My problem last night was that I already had 6.2.0 alpha installed on Kodi 17.6 but it "upgraded" back to 6.1.1 stable when I pushed the update button.
Now it gives me YouTube error (some python script error from log) and I cannot go back to 6.2alpha (which was slow and stopped channel after 2 sec but no YouTube errors) after several reboots of PC and KODI.

So what can I try? Are input.adaptive and YouTube 6.1.1 default settings for Kodi 17.6 ok or do I need different settings for YouTube play upto 720p?

3. What is the update situation with Kodi 18alpha3 (latest?), and does it require DASH (or is it included in your YouTube plugin without need for input.adaptive)?