How do I keep my technical roadmap healthy over time?

You set a technical roadmap that carries the product forward while keeping the platform sound. That balance is hard to strike and harder to hold, and the fact that you manage both at once says you see the whole picture, not just your corner of it. That is worth recognizing. The threat to a good roadmap is not neglect; it is the slow drift of reality away from the plan. Priorities shift, the business changes direction, what looked essential six months ago quietly stops mattering. A roadmap followed too rigidly can become as harmful as having none at all. So hold your plan firmly but not stiffly. Revisit it on a regular rhythm, every quarter, and be honest about what has changed and what should drop off. Keep it a living document, tied to where the business actually is now. The strength of a roadmap is not that it never changes. It is that it changes on purpose, with your eyes open.