Well this piece summarizes it well. iPhones 12, 13 and 14 support MagSafe with a 15W maximum and can use Qi chargers but only up to 7.5W (and sometimes 5W).
The new Qi2 chargers use the same magnets as the MagSafe and will provide 15W but only for qi2 compatible phones. Only the new iPhone 15 will be Qi2 compatible.
So net, net, keep your MagSafes for now as long can as you have the older iPhone 13s and 14s that could be a while before Qi2 takes over unless. Hopefully Apple will either upgrade firmware to make iPhone 12, 13 and 14 work with Qi2 or combo MagSafe+Qi2 will ship
