What was the point of Goku and Vegeta training 3 years in the ROSAT?

[Hugo Boss]

I think the point was to get as close as possible to Beerus or "Monaka" in strength. This way they could be at least one step or two above Golden Freeza.

[Mazingerdestro]

I do not consider these 3 years as a training to improve your power but to explore the possibilities of Blue.
Basically wasting days or months meditating answer improving ki control.
For Goku that training resulted in kaioken.

Also it's not official but Goku blue>>>>>Frieza after rosat

[MagmonKai]

I think Vegeta was right...they're at their limits on what they can accomplish now. Their blue form probably will be improved upon, but it's not like they got really strong after leaving the ROSAT.