First of all thanks for making this post so we can comment on the how the presale worked.

For this time I would most likely support the proposal, in order to keep satisfaction and retention with as many community members as possible. But I actually do see some problems with the proposal.

1. As you wrote "Many in the rush to purchase packs did not notice or understand and clicked furiously to get the packs they came to buy." I myself, see that as their own fault, because they did not recheck what they were buying. Therefore taking the risk of making mistakes but being faster than other people, that might have rechecked it and were too late to buy in the presale. So in a way if point 1 passes and point 3 is not passed, I wont see it to be as fair towards the players that were too late. In my opinion actually both players of 1 and 3 made mistakes (1. they didn't check it properly and 3. They were too late)

2. I agree

3. As other people already stated a 3 minute period sounds fine for this time. However I would actually say that a 2 minute period would feel better. Also for future sales. I would say 2 minutes sounds better, but it still might cause a x4 more intended promocard minting.
   Is it not possible to make it something like a 2 minute period or a 5% margin of presale packs (instead of the now 10%) whichever comes first.

I myself was lucky this time because I was in the last block. However If I missed it with just a few blocks I would be pissed as well, but if missed out with 1minute and 21seconds, I would actually kick myself for being late, instead of blaming the company/presale.

What might also be possible for future pre-sales is do like IPOs of companies where they have a sign-up period where the buyers put in how many stocks/packs they would like to buy. And at presale everyone would get the amount they wanted or when there is too much interest and its oversold, they would only get a portion of it for the presale while the rest goes into general sale. It might cause problems for instance with promocards, because there is a big chance everybody might not get enough packs to get a promo but those are things for you guys to find solutions for :D
It's at least something to think about!