Given the 2018-2019 system will be a bo1 system for elimination, I strongly believe a VAR (Video Assisted Refereeing) system would be beneficial to teams competiting. Take the world cup as an example, there were times where the Ref was unable to draw a conclusion without the assistance of VAR. The same applies to VEX, there are times where it will be extremely difficult to judge.
Easier to settle disputes between teams
If 2 alliances ends up in an argument about rule infractions, using official video footage, a decision could be made and teams would not argue further given there would be video footage used as evidence.
Determine whether an infraction would be considered as match affecting.
The term match affecting is easy to understand, but in reality it is very hard to determine whether an action would be considered match affecting. Such as pinning or trapping beyond the time allowed or recklessly driving around and destroying an intake mechanism, resulting in a team not able to score. These are just a few examples that occured from my experience, I am sure there are more examples where a VAR system would beneficial.
The BO1 elimination system
This pretty much sums up why VAR should be implemented. BO1 is just too inconsistent, and there are times where a reviewing video footage would be easier to draw conclusions and make sure no teams were eliminated in an unfair fashion
Edit: TO1 would still be in force, referees would only be allowed to review official footage. Players would not be able to provide their own recordings as video evidence