All tramp needs to do is keep a simple counter of how many times it
attempts "exec env TERM='dumb'...."

How many times should be enough? 10?

Just count that please.

Otherwise even attempting to get traces will blow out one's disk drives.

Also maybe it should first send a command to "condition the terminal",
similar to stty -echo etc.

Then a second command to "exec ..."

That way maybe tramp could tell if it got a response or not.

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