Only if you are not good at process. If you have solid practices, documentation and system design skills you can make yourself removable, then you can go on leave whenever and things will be fine.

A good way to measure this is look at how long it takes to do handover when someone leaves a project. If it is more than half an hour of showing someone where the repo is and a brief explanation then you have a problem that can be fixed with better processes. Ideally, someone should be able to pick up a project or a product very quickly as all the information they need should be in a simple, easily navigable format that they can consume and understand. I realise that is an ideal case but if you are senior enough to lead you can be senior enough to never make yourself a dependency and that callback never comes because it is never required. Ensuring management above you understands your value is another problem (anyone who can code themselves out of a job is worth keeping around and giving harder jobs to and good managers will understand that).