A lot of people never have problems with spacers, but some people do. There's always the chance that you'll be one of them.
If you get spacers you usually have to get longer bolts which increases the risk of those bolts breaking ESPECIALLY if you plan to go offroad with your X.
Tire rubbing is also a common issue, along with incorrect installation which can cause numerous problems, and there's a few others but I'm blanking.
Because of those reasons I have decided to not get spacers and save my money to get wider tries and rims in the future. Much safer and more reliable option.
You don't need longer bolts for the real spacers, just the ones you should never use anyway.
The real ones use one set of bolts to bolt the spacer to the hub, and, you then bolt the rim to the spacer instead, as if it were the hub.
For the X, REAR spacers work fine because its a live axle that doesn't steer.
FRONT spacers make it so you can't fit as large a tire, for the same work...because you have IFS and it steers....and too little BS means the tire swings in a wider arc, and hits more stuff in the way unless you trim more...
and with less trimming, and more BS, you COULD HAVE fit a larger tire.
So, we get 5.5" from the factory, which actually works best as far as large tire fitment.
A 1.5" spacer reduces the BS to only 4".
I could mount 33 x 13.5/16 LTB mud tires on the stock rims, and trim only plastic to do it. (With 2" BL).
If I only had 4" BS, I'd be trimming metal to mount 31's.
A 31x10.5 tire is narrower than a 33 x 13.5" tire by ~ 3"
That means my 13.5" tire sticks out ~ 1.5" more than a 10.5" tire would.
So, I can have a real fat off road tire that WORKS, or, a skinny wussy tire that would fit a stock X, but is on training wheels to stick out the same amount as my real tires.
I'd rather go for GO than SHOW.
>
My personal solution was to use the stock rims in front, with no spacers, and, add rear 1.5" spacers ONLY.
It worked like a charm....and, as I used real spacers, and lock-tite, and a torque wrench, they stayed on w/o a peep for about 350,000 miles. They are still on, but, I have that axle in my back yard awaiting another project and its not on the road at the moment.
I've also run them on my jeeps w/o a problem, for decades....etc.
As a clarification - If you can run the same BS on all 4 corners, cheap rims with less BS do exactly the same thing as spacers, for less.
On the X though, the front should not have spacers due to the reduced clearance, so, to avoid needing a front spare and a rear spare, its easier to carry one spare, and have spacers on the rear hubs.