Ok, let me try again, cottin' pickin' dial up ate my post
Not all airless pumps are equal. While I suspect a diy type pump would require thinning of latex, most commercial type airless pumps do not. I have 2 small titan airless's that pump about 3 qts per minute - they will spray most any latex straight out of the bucket. I used to work for an outfit that had several graco 733's [pump 3 gpm] Those pumps are capable of spraying block fill and elastromeric paint unthinned.
I've sprayed and/or been around spray equipment for 40yrs but had never heard of a rotary sprayer until now.