The thing about this tournament is that it's split into two sections, group and bracket. It's too late to change the group stage, since that's already happened. However, changing the bracket stage from bo3 to bo1 shouldn't be capable of giving one team an advantage over another. I'd say that the purchase of a vehicle is a decent analogy. Instead of money, we're committing our time and effort to participate in the tournament and make it successful, which provides entertainment for your viewers. If you want we can change it to signing up for a marathon only to have them change it to a 100-meter dash.
The data I used did come from the more recent videos where teams like the Ducks, Sac, The Gents, CSR, etc participate. Or 'the same exact groups that will be in this tournament'. There's also a lot more data to pull from. But it really depends on what data is chosen to be used and chosen to be ignored that really determine which way the statistics will go. And of course one of the biggest factors is the map luck.
maps: If you know what map is coming, and you know your playstyle doesn't work well on it, this gives you ample time to change or improve your playstyle for that map, which leads to a better match. This might actually be the biggest contributor to the belief that we need a best of three to determine who should win. If both teams know how things are going to go down, there's no excuses for 'well, my playstyle doesn't work well on this map', since they had the time to fix that.
bugs: It really depends on the bug. Most bugs and issues generally result in a pause of the match; and occasionally need a restart. Disconnecting in the middle of an engagement isn't all that common, at least as far as I'm aware. More importantly, bugs affect matches, not just kill counts. And even in Bo3, they try to have the most balanced matches possible. Pausing, resetting, etc when someone suffers a bug on that scale. This causes the matches to go much longer, and generally happens more than once. With a best of one, the total match time is much shorter since you only have to play one match. Making adjustments for critical bugs easier to accommodate.