In the past, laminated glass was usually installed in the windshield, with side and rear windows being tempered only.
The difference is that tempered glass is per-stressed so that when it cracks, it shatters into many tiny and dull pieces. Laminated is the same thing, but with layers of plastic sandwiched with layers of tempered glass. Laminated glass will still shatter, but will be held together by the plastic layers.
In an emergency, small improvised, or purpose built tools meant to shatter tempered glass will be useless if the glass is laminated.
A spare tire is not exactly what I would consider a safety feature. It's more of a convenience feature, and not even that in most circumstances.
In most situations it's far safer to get roadside assistance. It's not a great idea to be sitting at the side of the road outside the protection of your vehicle and involved in a task that holds much of your attention. A professional with the right tools can change that tire in a fraction of the time, and they will have far more protection from the positioning of their vehicle and it's lights.
In some cases, for some people, a spare tire could be a safety feature, some of the time. For instance, if you frequently drive back and forth across the US, there are lots of areas where assistance will be far away and potentially even unreachable. Nothing stops people from getting their own spare and throwing it in the trunk of it makes sense for them.