ye.,
but that does not mean,that those with lesser abilty should not perform ,abilty is important, but so is practice,with practice it is possible to improve performance.
most professional performers were not so good when they first started they need encouragement and the opportunity to learn stage craft and performing skills,but with practice they improved.
so performance ability does matter,it is important for all perfrormers to have goals,levels to aim at etc,but all performers need to practise .with practice comes improvement .
attending workshops is a good idea too .