Radars main purpose is not to capture everything, it's to boost luma chances, which will be done in 6 times more quickly than what you stated initially.Again, someone else misses the point. They give you a radar for defeating a Dojo. Do they expect people not to use it? The only way to not feel like the game is wasting your time is to not play it. Bold strategy.
I think you are missing the points of radars. Radars do not provide you with the only occasion to catch/release Tems, you can do that elsewhere, on Tems which are easier to catch, if you do not have time to do that on 30 Capture Rate Tems.
Your complaint would be valid if FreeTems was only feasible through Radar, which is not the case, as far as I know.
Anyway, I'm off, have fun.