@Jjim and
@andyglym have pretty much hit the nail the head.
It totally depends what you do with your zed whether removing the spare is beneficial or not.
Like the guys have said If you are unfortunate enough to get a flat or damaged wheel fine if your in the city and you can go grab a coffee while you're waiting but if your like myself and a few others you take your zed to the more remote area's of the country puts a different light on things.
On my Scottish run in 2019 we were up at Kyle of Lochalsh as our base on day 1
@Sean d was unfortunate to hit a huge pothole splitting his rear wheel at this point we were here
78 miles from the hotel right at the top of Skye in the middle of nowhere no phone signal space saver got Sean back to the hotel.
Then the following morning
@Jjim ended up with a flat from a cracked wheel and had to use a space saver to return to the hotel but still stopped him from being stranded on the side of the road for hours .
So depending what you do with your zed personally I would refurbish it all ( wheel and cradle assembly) and refit it then you know it will dig you out of a spot if you get a flat .
Stephen.