Hi,
One of the reasons we add the brand name at the end of a title is to allow for users to recognise the brand, whether they are new users and have heard of the brand and thus are more likely to trust it, or returning users who have used our website before and weren't aware that another service was offered, but are more willing to return to a website where they have had a good experience.
It also ensures your brand SEO is as strong as possible, so if someone were to search your brand name they wouldn't be presented with a competitor who happened to mention your website a few times, rather than your website.