Do not give it too much of a thought.
These consideration are more of less only a concern in tournaments of the very highest caliber players.
I mean, it is fair to pay an interest for the sake of general knowledge. But please, use any game you like in a competitive setting.
In my experience, I've seen far more problems with pinball machines used in tournaments due to wear, malfunction, incorrect software adjustments, bullshit LEDs, burnt bulbs, bad leveling etc. than due to the games own geometry and rules.
The problem of a pinball machine for tournament use is not really that people utilise repetitive and simple shot patterns. Although it will turn out to be a boring tournament, It actually requires skill to repete shots. The problem is if playing time on a game is too long. So, adjust games to avoid that though still being a fair battlefield and you have a tournament.