Hmm, I am unconvinced that the reason for this is due to a lack of tooling for debugging the underlying infrastructure.
Let's consider Javascript -- the debuggers generally only debug Javascript and don't do any of the extra things you're talking about.
Yet people find it to be a perfectly reasonable language and it is very popular.
It also has an algorithmic evaluation strategy, where i/o occurs outside the program flow (with the exception of things like nodejs and ajax synchronous calls, but these are pretty exceptional).
If your idea was the reason for a lack of popularity in functional languages you'd expect it to apply here as well, but it doesn't.
I think the true causes are probably (a) network effects, and (b) people are taught mechanical evaluation models from a early age [so, really network effects again].
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Hmm, I am unconvinced that the reason for this is due to a lack of tooling for debugging the underlying infrastructure.
Let's consider Javascript -- the debuggers generally only debug Javascript and don't do any of the extra things you're talking about.
Yet people find it to be a perfectly reasonable language and it is very popular.
It also has an algorithmic evaluation strategy, where i/o occurs outside the program flow (with the exception of things like nodejs and ajax synchronous calls, but these are pretty exceptional).
If your idea was the reason for a lack of popularity in functional languages you'd expect it to apply here as well, but it doesn't.
I think the true causes are probably (a) network effects, and (b) people are taught mechanical evaluation models from a early age [so, really network effects again].