I doubt that Lazlo regrets selling 10k bitcoin for two pizzas,
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Lazlo got interview for many times by media network and we can see that there's no regret on his side for doing that transaction. You can check those clips on youtube since there are videos out there related to that situation. The guy enjoy that Pizza and that's what important for him at that time.
As far as I remember the people who regret on their lose bitcoin is those who throw out his bitcoin to trash and who forget his seedphrase or password.
But for us normal people yeah for sure we feel like its wasted opportunity to let those things slip on his hands but that's what happen and nothing will be changed. There would be no bitcoin pizza day if that transaction didn't happen.
Yeah you are right that he didn't regret using 10000BTC to buy pizza as at that time and there's one thing i always tell people not to dwell so much in the past because it doesn't have anything good to teach except for someone who is not making progress in life that will always deliberate on the mistakes of the past but that not withstanding, some things do happen for something to be recognized and be remembered for. Here we are celebrating bitcoins pizza day, if Lazlo didn't make such transaction i believe there will be no pizza day but the memorable event has always been a reminder to bitcoiners to refresh our memories on how far bitcoin has gone because now, we know the value of 10k BTC and what it can afford.
It's also a kind of reminder not to belittle our small beginning just like we that are still in accumulating stages of our investment in bitcoin now, in the future we will also look back at when we started and see how far and successful we have become with our hodlings and we will be glad we took this bold step.