Limiting your turns to final to 20 degrees AoB is normal aviation practice and has come about because a lot of people lost their lives by doing more, with not enough speed.
Actually I'd use 30 deg AOB on base to final - as I was taught a while ago now. Now on climb out on turn to crosswind, I'd limit my turn to 20 deg, maybe less.
Here is another example:
I do crosswinds using the wing down method. It has worked for me for 8 years, and in up to 25kts (TB10) - I'd even say I'm pretty good at them. No worries, never scraped a wing along the runway yet. Fly with nervous instructor who insists I use a crab method with a big bootfull of rudder last minute....Because that is the way he was taught at Oxford. He even starts interfering with the controls when I am making a perfectly good approach and landing.....idiot. He did complement me on my 180 deg turn on instruments though - no sh*t, I had a current IR so if I couldn't do that then there is seriously something wrong.......
