This whole discussion boils down to the installation quality. If the work is installed properly, with UL listed components, there should be no real issue.
In my 30+ years as an licensed electrician and contractor, I have developed my own preferences. Overall, I am in the compression camp, but also know that in a disaster, set-screw connectors/couplings will hang on longer than compression. But I don't like the dimple the SS causes in the conduit. Deforming of the conduit can and does causes problems when pulling cable and can damage conductors.
I agree with the comments that steel is preferred over cast. Generally the cast will break because of too much pressure being applied. The steel seems to work much better.
And where is the discussion about the indentor-type "compression" fittings? They seem to have been long forgotten, but presented the same problems as SS fittings do today. But they certainly would hang on forever.
Quality has a price, both in materials and labor. A ECG provides that extra layer of assurance that the operation of the OCP will function should the end device have a failure to ground.
Just my 2-cents. W A Boyd
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