The little plastic rivets are designed by factory lawyers to self destruct (see the attached images of the stages of decay) if you were to snag them on a wheat thresher, barbed wire fence or the clutches of a rabid Marmoset. Yes- they are designed to give way and release you from harm... usually at the worst possible and inopportune moment.
By using a bit of BUNGEE Cord and some soft tubing, you can improve your shoes to CROC 2.0
Step 2: Softer feeling straps than the originals for sure!
Step 3: Tubing: so many choices
Step 4: Bungee! (Not the kind you jump off bridges with)
You can buy it at fabric stores, camping supply, or just canibalize it from an automotive luggage tie down. I got this stuff from the outside of some roller duffel bags. I kind of like the 1/8" stuff, but the fat stuff works okay, too.