Kevin Beckett - Love the feedback.
1) Agree we should have a warning/error that appears when the underlying API is missing. :) Since our rollout is expected to take a few days, its absence should only be a transient problem. But we'll fix that. :)
2) Also great feedback on the homepage. We did spend a fair bit of time debating whether to automatically provision a new page for every group, and did settle on offering an option to prevent its automatic promotion to being the homepage. We can see a set of customers that would love to have the option to flip over to the new home page once they've customized it, but also see another set that want full control. I'll take this as an opportunity to consider the ability to suppress the creation of the new page.
3) On the PnP front, we're definitely looking at ways to offer up ways to configure/customize the way these tools 'modernize' sites. Stay tuned for more here.
Keep the feedback coming, we love it.
Tejas