The working speed of flail systems is a walking pace, the working speed of most other mechanical mineclearing systems is a slow bicycle pace.
Neither is a good convoy protection answer to under-road mines + neither provides protection against off-route mines.
These offence-defence spirals at low war intensity* won't yield any decision and thus deserve little attention. The key problem is the problem of IFF.
*: Most forms of possible combat are impossible because of an incapable enemy, after all.
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