For the most part, the only reason to do a SYE is to facilitate a double cardan shaft. The bonus is that you get a fixed output yoke on the transfer case which I like better as it is a more solid way of attaching things. Another bonus is that you shorten the output of the transfer case, thereby lengthening the shaft, and reducing angles, but this change in angle is subtle, the extra length only reduced the drive shaft angle by maybe 4 degrees. These bonus changes are great but the reason for the sye is to facilitate the double cardan shaft. The double cardan shaft requires that you rotate the pinion up of course but that is actually where you get a lot of the angle reduction. You can see how the angle reduction progresses with each step in the video embedded on the page below.
Then there's the matter of almost every SYE coming with a 1310 CV style yoke. This yoke won't work with a non-cv shaft. I'm pretty sure Advance Adapters sells the SYE with no yoke and then you can get the non-cv yoke separately but this will also require that you change the seal in the SYE housing. It can be a bit more of a challenge to get an SYE setup for a non-cv shaft.
If you are wanting to run a non-cv shaft, I'd recommend that you forego the SYE and just run a stock type shaft. I don't think that the small advantages of doing the sye without the CV shaft are substantial enough to justify the expense and the labor. Where I'd make an exception, where I'd recommend a SYE and a non-cv shaft, is here: If a guy has a bent or broken output shaft and has to replace the output shaft of the transfer case anyway but has a stock height (no lift) Jeep. In this scenario the guy has to get a new output shaft and tear apart the t-case anyway so he might as well make the upgrade. Then, when in comes to the shaft there's no reason to switch the the CV and I like the simplicity of the single joint at each end of the shaft better, less things to wear out.
If you really want to do the SYE without the CV shaft, do it, but in my opinion you should either just save yourself a bunch of money and run the stock type shaft or spend the extra money to do the SYE and cv shaft.
The video on this page shows demonstrates how the angle changes progressively change with each step of the SYE, CV, and Control Arm process.
https://4xshaft.com/blogs/general-t...-eliminator-installation-purpose-and-benefits