It's not just the Sage company. Here in Germany, it is now almost impossible to find a decent invoicing or accounting software that does not require a subscription.
As far as I can see, only a handful of companies share the German market for invoicing and accounting software for small and medium-sized businesses.
One of my accounting programs even had a VAT adjustment feature removed with an update. Had to continue working with the previous version when a VAT increase came.
While I can understand the subscription model for accounting software - there are major tax changes every year - the subscription makes no sense for invoicing software.
I have since switched to an Austrian vendor for invoicing. Their software is not perfect, but does not require a subscription. Only the update notice at program start is annoying. My bookkeeping is now done by the tax consultant.
PS: I am irritated that there is no open-source invoicing software that supports cash discounts and multiple delivery addresses for customers.