Hi Alex,
I would like to follow the topic. I have the same 'issue' as Milada.
Your answer is half correct. Yes, we can include the same section many times into the same form. But why we have to change the node name each time.
I suppose the most common case is that we include such a section only once. e.g. address section or contact person as a common part of many forms and is expected to keep the original node name.
Of course, when form author wants to include the same section more than once, the name of the section should be rather something like address-1 address-2 then section-1, etc.
Please take into account that form authors are usually no technical persons and imagine how difficult is to explain to them that they have to remember to change node name. To be honest I also have the same problem:)
The same case is with the section's label. Labels are not copied when you use template. I don't remember exactly, but there was reported such bug - (ver. 2018.2.1 CE)
//Jarek