I work in a cabinet shop which has no SCMS, just a 12" Makita CMS. Of course there is an 11' panel saw with a 14" blade about 10 feet from the chop saw, but still we get by without a SCMS!
Seriously, it depends on how you like to work, what you make mostly, and what other methods you have available. No reason you must have a slider except as determined by you.
Oh, about that RAS is death trap comment. Shame on you for displaying your ignorance with such bravado. There are many machines that bare the monicker RAS which would function better as boat anchors, but there is nothing implicitly more dangerous about a GOOD WELL TUNED QUALITY RAS than any other wood cutting machine.
It will cost you several thousand dollars to get a RAS as good as mine today, and for most that is simply not worth it. I got mine free, so it was worth it to me. Also it helps to know how to use one, and that is more difficult information to acquire these days too. I wouldn't recommend a RAS in this day and age for home use as a necessity, but it would be hard for me to work w/o mine, and no SCMS or chop box can do what my RAS can. It's like comparing apples to Sherman Tanks.