We'd like to let individuals pay membership fees incrementally, e.g. four quarterly occurring payments of 0.25M (where M is the total membership fee). It looks like the devs sought to do something like this previously in the Civi core, and there may have been partial payment function deployed in 4.7 -- see this thread and this thread too. But I'm not seeing anything in our live install of 5.4.0 (running on WP 4.9.8) that supports creation of new membership once user has made two or more contributions of which the sum meets or exceeds the membership fee.
Am I missing something? And if not, is there any appetite for an extension or core enhancement that would enable both tracking of partial membership payments and creation of membership (or renewal of membership) once the membership fee is paid in full?