You're right, just surmising and maybe wrong, though given a choice most pilots would choose to avoid landing in a thunderstorm.
If this sort of surmising is wrong, then apologies, I'm guilty.
What worries me though is that I do know of a 757 which did have to land in a thunderstorm recently (successfully this time) so if my surmising is correct surely lessons are there to be learned, and the sooner the better.