In the '80s we practiced limited power (running take-offs and landings) extensively in the Gazelle, down to where you had to wiggle the cyclic and pedals to induce any movement at all and sometimes run for tens of metres before gaining TL.
This became even more important a technique on the Bell 47 - a normal situation.
Subsequently I was grateful for a solid grounding in limited power when operating 206s in hot and high environments. I'm astonished that running take offs and landings are considered odd, or that advice is not to fly if a vertical take off isn't achieveable. How pampered are todays pilots with such surpluses of power! And presumably how hampered when the surplus runs out.
I'm pretty sure we practiced routine rolling take-offs in the S61 too - and of course single-engined landings. The Chinook ran on in an auto at about 60Kts afair, nose high in the air, needed hundreds and hundreds of metres to stop.