That’s the big one. Make it like the NFL. If you’re not ready to review by the time the linesman is at the dot for the face off, tough luck. Don’t give a coach 3 minutes to consult his video guy, then be satisfied only when the coach declines to review.
Yup. Goal is scored, officials skate over to the bench of the team giving up the goal and ask "do you want to challenge?" Anything less than an immediate "yes" is considered a "no" and play goes on. The whole reason for this ridiculous system was a blatant, you-could-tell-in-real-time missed call. Especially if you're going to gamify the whole challenge process (something that I don't particularly care for - it shouldn't be the job of the teams competing to correct your on-ice officials' mistakes, but that's another topic). "Are you willing to risk a DoG minor?" is a really hollow penalty when teams are given minutes to make sure that their challenge won't fail. I also have to wonder if there's a meta-level impact of the penalty always being applied now: the reviewers have it in their minds that a team wouldn't risk digging a deeper hole for themselves with a frivolous challenge, so
that biases them toward overturning the goal even when things aren't "conclusive".
I'm usually the opposite of a Luddite - if you have the tech, use it. But here, I feel like if you're going to trust the linesmen with the ability to halt play for offsides (where they may get it wrong and kill a legit scoring chance), you need to trust them when they let a play proceed. Train them to be the best they can be, save the microscope treatment for after-game assessments and incentivize them for making the least number of wrong/missed calls. Save the replay stuff for actual game-changing judgment calls like major/match penalties, where another official can confirm the call with the benefit of multiple camera angles, slo-mo, etc.