Canon Observation: Force Push Only Works Against Vulnerable Opponents
Every single Force push dished out during a fight, within the TV shows and films continuity, either features a disarmed or open opponent.
The red represents a vulnerable character who was pushed. A blue represents a prepared character who resists.
> Episode I: Darth Maul vs Obi-Wan Kenobi - https://www.youtube.com/watch?v=yHqdESArkqU&t=4m06s
> Clone Wars: Dooku vs Anakin Skywalker - https://www.youtube.com/watch?v=HKrUrAvSnOs&t=2m07s
> Clone Wars: Asajj Ventress vs Luminara Unduli - https://www.youtube.com/watch?v=HKrUrAvSnOs&t=7m23s
> Clone Wars: Asajj Ventress vs Anakin Skywalker - https://www.youtube.com/watch?v=WDTDCRmYM9Q&t=3m32s
> Clone Wars: Dooku vs Nightsisters - https://www.youtube.com/watch?v=HKrUrAvSnOs&t=22m49s
> Clone Wars: Dooku vs Nightsisers - https://www.youtube.com/watch?v=HKrUrAvSnOs&t=23m49s
> Clone Wars: Dooku vs Asajj Ventress - https://www.youtube.com/watch?v=HKrUrAvSnOs&t=26m56s
> Clone Wars: Dooku vs Asajj Ventress - https://www.youtube.com/watch?v=HKrUrAvSnOs&t=26m58s
> Clone Wars: Darth Maul vs Obi-Wan Kenobi - https://www.youtube.com/watch?v=HKrUrAvSnOs&t=39m20s
> Clone Wars: Darth Sidious vs Darth Maul - https://www.youtube.com/watch?v=HKrUrAvSnOs&t=47m24s
> Clone Wars: Barris Offee vs Anakin Skywalker - https://www.youtube.com/watch?v=HKrUrAvSnOs&t=50m58s
> Clone Wars: Dooku vs Anakin Skywalker and Obi-Wan Kenobi - https://www.youtube.com/watch?v=HKrUrAvSnOs&t=53m53s
> Clone Wars: Darth Sidious vs Yoda - https://www.youtube.com/watch?v=HKrUrAvSnOs&t=56m38s
> Rebels: Grand Inquisitor vs Kanan Jarrus - https://www.youtube.com/watch?v=HKrUrAvSnOs&t=59m58s
> Rebels: Grand Inquisitor vs Kanan Jarrus - https://www.youtube.com/watch?v=kFXr3PLUdvk&t=3m19s
> Rebels: Darth Vader vs Kanan Jarrus and Ezra Bridger - https://www.youtube.com/watch?v=HKrUrAvSnOs&t=1h07m40s
> Rebels: Darth Vader vs Kanan Jarrus and Ezra Bridger - https://www.youtube.com/watch?v=HKrUrAvSnOs&t=1h08m55s
> Rebels: Darth Maul vs Eighth Brother - https://www.youtube.com/watch?v=HKrUrAvSnOs&t=1h26m11s
> Rebels: Darth Vader vs Ahsoka Tano - https://www.youtube.com/watch?v=Nr7ufR7utEo&t=2m09s
> Rebels: Darth Vader vs Ahsoka Tano - https://www.youtube.com/watch?v=Nr7ufR7utEo&t=2m55s
Based off these findings, I can only conclude that telekinesis is only effective in small openings when the opponent is vulnerable.
Force push is not an ability that Force users can use to batter a ready combatant into submission, despite popular belief of the contrary.
This explains why telekinesis is not used more in Canon fights, especially when a more powerful character is fighting a less powerful character.
This also explains how Ahsoka Tano and Asajj Ventress were able to Force push Darth Vader and Dooku respectively, and why Yoda did not subdue Dooku.