USCIS’s process does not have to change their process to accommodate anyone who has knowingly put themselves in a state whereby a departure from the US following a DV selection could result in a 3 or 10 year ban due to an overstay. Not being able to leave is not USCIS’s fault, so claiming it’s unfair sounds ridiculous and makes no sense to me.
USCIS is already doing enough to accommodate DV based AOS petitions. Other petitions such as family or employment based AOS takes much more time than the DV based AOS. If anyone should be complaining it is those with other types of AOS in the system who gets jumped over year after year because USCIS is trying to accommodate DV based petitions. Bear in mind USCIS deal with a whole lot more than just AOS petitions.
Your DS260 form does not go directly to USCIS regardless of how early or how late the form was filled and submitted. The first step of the process as far as AOS is concerned is when you submit an AOS package, the DS260 form cannot be used to hold down a spot for someone simply because they submitted it early.
And finally, harsh as this may sound, you need to remember immigration, especially the opportunity to process AOS, is a privilege not a right. USCIS can and will continue to process such as they deem fit.