That doesn’t make it easier to do it yourself maize. Travel, logistics buying the equipment, getting into the stadium as opposed to asking a non opponent for film on their last/your future opponent.
And this whole day you have argued there is no difference getting it yourself or asking a team for that game film. Your linked tweet quite literally proves it’s more advantageous to be on the sideline than not.
Stallions did this because he and others on the coaching staff knew this was the best way to steal signs. Not game film from worse angles, this way. If that was false in any way there is no chance Stallions would have done this.