An easy litmus test to determine if any P should try to throw the split change is palming a basketball. If you can, you should give it a try. It takes big hands and long fingers for most pitchers to be able to throw the split change properly. I teach a grip as deep in the ball as any individual hand will allow. The horseshoe of the seams should face the P and the fingers should be deep enough in the ball so that you can see the leather of the baseball between the seams and the fingers. If you grip deep enough the ball tumbles forward as it comes out of the hand. This kills the velocity ( as intended) but also creates a pitch that breaks down but not horizontally. So it’s a different pitch than a circle (or any other) change. It can complement a traditional change up nicely if the pitches are different enough. A big benefit of having the split change in your arsenal is that it is very dependable once it’s mastered. You will rarely (if ever) have a day where you don’t have a feel for it and are reluctant to throw it. So I say it’s good to throw both - as long as they act differently. Another benefit of the spilt change is that it’s good R on R and/or L on L.
At 6'5" my son has very big hands and long fingers. The best way to describe his split is that when thrown it looks like the fastball until it's not there. His college catcher both when catching him and also hitting him during live BP's says it's just unfair how he feels he's on it, but the ball just isn't there to hit. When he wants a little different look to it he manipulates movement by rotating the ball in his grip to grab a tiny bit of seam, almost a forkball vs true split.
I would say it is a little bitter harder to master than adbono mentions, to get it to do what you want, but as far as just throwing it and that it will take spin and velocity off, it is just a grip it and rip it pitch. It is his primary off speed to lefthanded hitters.
One of his HS teammates taught it to him and they would throw it back and forth to each other during catch play, and that's how he determined it was something he could eventually master.