By far it's finding the time. It takes a whole day to set up and test run
25 renders - easily. It also takes ages to write the script prior to that. As even a shorter 4.1 release typically had 150 renders - that's 6 totally full days, except I don't have that because I work full time. As I like if possible to release a 4.1 every 3 weeks (can't always hit it), that means spending a great amount of every weekend upstairs away from my wife, and many week evenings when I come in fucked after work too - and my job too requires evening work for the next day.
What this tends to mean is that I also don't get much time for the fluff and fun stuff of running a Patreon account - which I hate to omit. Then on the final weekend I bring it all together - proof read it, fix the numerous renders which have clipping, or just something else I don't like etc - and then post it here (after Patreon pledges have been fulfilled).
And then some gent on the forum says 'it's short' or the writing is 'shoddy' etc.
By far what I like to do is the imagination stuff - to think about how the MFC will cuckold the MMC, or cheat on him etc - what story lines I can incorporate. I love bringing my ideas to life in renders - and seeing my story become real. Love that creative sort of stuff.
So time is always an issue if you have to work for a living as well - but the rewards are the feelings that you've truly created something - even if it's about NTR and everyone has a go at you about it
.