Depends. If you are working on the latest devices only then not really as the ‘trade’ has changed significantly.
The hardware is predominantly COTS technology and very little component level fault finding is performed. No hydraulics to worry about either.
However, if you are going to work on the older devices then you need to be a good all round technician and electronics is a must.
My staff work on both and all of them are (amongst various other disciplines) very competent electronic engineers.