From my experience it depends on trainer a lot. I worked with 2 trainers, who used to tell me I need to get flash, side reins to lunge, and this, and that... I switched to my current trainer and I ride in the simplest/gentlest possible tack (just a plain french link snaffle with noseband, no extra reins, straps, etc.). And we do progress (unlike with other trainers)!
"Life isn't about waiting for the storm to pass: it's about learning to dance in the rain..."
"When we are no longer able to change a situation - we are challenged to change ourselves."
"How people treat you is their karma; how you react is yours."