I can understand 17 being alive. If Vegeta can use a suicide move and survive, then so can 17.
Why did 17 not use his infinite stamina to get back up? Idk.
How did 17 and Frieza not get destroyed while Jiren and Goku were fucking everything up? Idk.
Why do rocks keep appearing to save everyone (how are they even floating) from falling and those rocks conveniently don't get destroyed, but the others do? Idk.