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Why

Malwarebytes has always been used as the first go-to tool for removing infections and has always been recommended as an excellent companion to run alongside other AV's.
What's Theatfire got to do with it

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MBAM was traditionally used for removing infections
not removed by other AV's..
Up to yesterday they claimed that MBAM is not an AV replacement, that targets mostly "zero days", and there is a long list of items "not targeted" by MBAM.
In time many vendors claimed a "signature less" 100% detection, yet all failed.
All my detection in the last 15 years were based on signatures and not on fancy things like behavior blocker, HIPS, etc.