FOr a Dynon Skyview system, all of the autopilot functions are in the included software. There are no options to buy. The basic Skyview system already comes with that capability in the software, only the AP servos themselves have to be added for that software to work.
Skyview software gets updated about every 3-4 months, and new capabilities are added. The latest rev had even more sophisticated AP functions than the prior version. All SV updates have been free. Regardless as to if you buy an SLSA or an ELSA, you will be updating the SV software when new versions come out. The ADSB-IN capability is an optional box. I just added one to my ELSA. It was an option for the SLSA buyers.
In other words, there is nothing "hobbled" about the SV installed in the SLSA. Now, it is a VFR system with only one GPS receiver and ADAHRs. Some who use Dynon in other EAB planes go dual with those sensors. If you go SLSA (not ELSA) you would have to get a permission letter from Vans to add such extra hardware.
You update SV software and aviation databases (also free) by downloading files onto a USB stick from the Dynon website, then put the stick into the SV in a provided USB port below the panel (or an extension cable that plugs into the back of the EFIS.) Then a command loads them into the system. The aviation monthly database updates are also free. I recommend the Dynon website.