Speaking as a long-time comics fan, I like the Marvel Comics approach to lore. Everything that happened, happened... but the timeline can advance and evolve, and past events can be reinterpreted (new context can be added, "true" backstories can be revealed, etc.) Just make sure everything is explained, somehow. This is something early 5E did (see SCAG, which included even 4E's lore in the backstory), but modern 5E does seem to have given up on, favoring reboots instead.
That said, credit where credit's due, they've gotten smarter with their reboots as of Dragonlance and Planescape. Yes, there are changes, but in broad strokes it can work well enough with older material. As opposed to Spelljammer (anything that depends on the old cosmology may be an awkward fit) and especially Van Richten's Ravenloft (which is a completely new setting). It's probably the most that can be realistically expected from Wizards at this point.