Yes, you need to be able to switch out the LGPL-licensed code, but dynamic linking is just the most convenient way to doing that—it's certainly never been required. You can also offer the rest of your combined work's code in a form suitable for re-linking (e.g., by providing .o or .a files for the rest of your app).

There is no requirement that end users be able to do any of this on a platform without becoming licensed developers for that platform. (At the time LGPL was written, many platform vendors charged hundreds or even thousands of dollars for their developer tools.)