My understanding is that Tomiki's 17 basic techniques were taken from judo to form his style of aikido. Tomiki wanted to preserve techniques that utilize a strike to create kuzushi such as shomen ate, aigamae ate,gyaku gamae ate, gedan ate, ushiro ate and also techniques which were performed at a greater distance than normal randori judo techniques. If this is correct, then what is so intrinsically different about these techniques to other judo techniques? Some of those techniques are still part of judo, such as waki-gatame. If it is necessary to have a competitive environment (either shiai or hard randori) to develop effective skills at judo techniques, how can this not be the same for aikido techniques which were once part of judo?
Most of the "basic" kata techniques are aikido techniques explained from the "judo" point of view. Tomiki sensei was heavily inspired by the doctrines of Jigoro Kano. Tomiki sensei also used Kendo principles in formulating his idea of randori/shiai. Especially the idea of "the ki of kendo".
Just my thoughts,