it's a shame that electrum doesn't offer 24 word seeds by default, I know it's possible by entering commands in the console but I'm afraid of compromising security, or doing something stupid, it's a bit off topic but do you know if they have an update planned?
To be honest, if you don't reveal your seed in an ordered way, then you can absolutely feel very secure by 12-word seed alone. You don't actually need 24-word seed.
In my opinion it does not matter if you use 12 word or 24 word seed phrases. IF your seed words get leaked you have an issue no matter what amount of words you have used.
If seed phrase gets leaked in an unordered way, then it can be a problem in case of 12-word seed but not for a 24-word seed. This is proven in that article.
I have to say also the 25 minutes who take maybe are a wrong calculation, because what if he was "lucky" to find the order on 25 minute, but you need to make more and more tries to find out the average time, not only one disorded seed.
Okay, create a wallet with 12-word seed, post phrases in unordered way and I'll honestly tell you how long it takes for me to crack that. Others can join the experiment too, or if you trust, I'll do this experiment myself, put phrases in list randomizer on random.org (if you have better idea, message me) and post the result.