We don't even have 3 yr old kinder up here and the kids are all fine, LOL. I wouldn't send my kid either. Sure, at 4 yo, that's the year before school so it's starting to get them ready for that just a few days a week but I think 3 yrs old is very different and young. I wouldn't send my child (taking into account I'm a SAHM so easy for me to make that choice). And I highly doubt a child would be disadvantaged in any way by not going at 3yo.