Matching a path with optional segments

[Stopa]

Hey! Confused about matching behaviour seemingly new to v6 (after migrating our application from v5).

Say I'm on some path, /path/to/something/ and I need to match it with useMatch.

1. useMatch('/path/to/:slug') matches
2. useMatch('/path/to/:slug?') does not match

Is this intentional? What is the reasoning behind this? This makes it harder to reuse paths -- ideally I would like to have a path pattern in a variable and reuse it across the application for routes, links, matches, etc.