Key issues in insulation (facade and/or drywall)

Hello everyone,

I am currently researching on behalf of someone about particularly tricky issues in insulation, about which manufacturers prefer to remain discreet and do not want to provide any information.

So to all the professionals here: What are such points where you would like to have more information from the manufacturers?

An example from a well-known planner is that there are often no processing instructions for ETICS at window sills, and this has caused him difficulties more than once.

What topics and tricky spots are there here that cause you difficulties?

PS: I am not an expert, so please formulate as simply as possible