(FSCS doesn't protect you from the problem this article was about either, and that seems much more likely to happen than one of the large banks being allowed to fail..)
Their accounts are super easy to setup, if their fee structure fits how you work then it's probably worth having one even if it's "just in case" to keep your options open.
Tide is not without its issues. For example, there's no way to accept payment from a non-UK account (no IBAN, BIC, SWIFT). It's also tied to a single person's mobile phone (even log-in to the web banking requires that one person's phone), even though we're a limited company, making it somewhat awkward for book-keeping purposes.
The traditional banks are far from perfect but Tide is not right for every business just yet.