Curious as to why this is the case. I can see how loops can enter a race condition, but for those of us that know how to properly run loops, why can’t we do this? Put the impetus on the user to make the decision.
I totally agree with you. The only reason why this is not yet available is “no time yet” 
- it is certainly on our todo list for 2019.
Workaround: You can already use GotoIf to create nested loops.
Yes, nested ifs and whiles REALLY need to be implemented. This is a crucial thing.
Waiting for it 
It will be in the next update later this month
Glad to hear these news - Nested ifs will give so much more flexibility.
With V5.1.5, nested if/while/do loops are finally supported 
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