I can't comment on the detection accuracy because this extension makes an important mistake -- it ignores the actual URL you are on and always performs detection on the root domain. So if I point the extension to a webapp at app.mycompany.com I get results for our marketing site at mycompany.com, which uses completely different (and more boring) tech.
Yes, WR currently considers subdomains as a part of the main domain.
Most users like to know the full tech stack of a website. If there is a blog at blog.company.com and if it is using Intercom, it can be a useful data. I hope this makes sense.
Anyway, we will definitely address this concern and think about adding an option for subdomain separation.
