I was going to masters swimming for a year and I felt like an odd fish.
In the end I just did my own thing, e.g. using the kick board I just did not go forward so had to ditch that, what is a pull buoy about? etc etc.
I looked at the competition results and saw that i could not even beat people in the male 90+ category (I am 62) so I didn't go on to the meets.
You get a good workout and if you're socially inclined they are generally a nice bunch.
As for improving swimming for TI ? Dunno.