Really? WorldCoin has proven this? Which other coin has had an entire mining pool mining on an orphan blockchain for more than 300 consecutive blocks?
The problems were reported by miners; no one lost coins in transactions, at least none were reported.
Also, the pool that took over the blockchain (erundook's) was at about 90% of the hash power since pools just started popping up and his was the most popular at the moment. Ask him.
Fortunately, we are down to only one issue which the OP didn't bring up (powpow did) and that is, will traders lose coins. I'd say 300 blocks was a good test for that.