Coming back to the original post....
In terms of general recommendations I would second @erktrek 's suggestion re HPM (don't let the BETA tag bother you... None of us do 
). As close to essential as you can come in my book... Probably a close tie with the Hub Info driver by @thebearmay....
Which leads onto your question about troubleshooting.... Alongside using Hub Info to assess and trigger automations based on memory and CPU usage or temperature, there are other built-in pages for looking at your Zigbee network, general device and app logs and resource usage statistics, plus others I have probably forgotten. There are also various Community apps and drivers that can help assess the availability of other hubs using PING, general device health and the status of your Internet connection.
I am all for making the introduction to home automation and in particular HE as easy as it can be. And can understand those who may see what can seem a lengthy read imposing in order to get something simple setup. I look at it another way..... There is a wealth of knowledge captured here. And to find that on your own can be daunting and not the best use of your time. But asking a question on the Community provides an opportunity to connect with people with a similar interest and setup. It also keeps those topics current on the Community, indicating to those that look for those things that people are still interested in those devices or services.
Simon
