Re: The point of aikido osae
In Tomiki Aikido we have Osae Waza. Osae (komi) waza is mat work--pins like Kesa Gatame, Kami Shiho Gatame, Kezure Kami Shiho, Makura kesa Gatame etc. Arm locks come under Kansetsu Waza, chokes come under Shime Waza. Personally, I don't hold people down with any Aikido Osae waza. I'm not saying it can't be done but I don't feel I'd like to struggle with someone. It looks good but I don't need to look good. I prefer to use shime waza--chokes--and kansetsu waza--armbars--because they are fast, easy and effective and there are many ways to choke someone and armbar someone form any position.
Judo classes have great Ne waza (ground work) if you are interested in learning great matwork, chokes and armbars.