What a junk article, this makes 0 sense and should probably just be deleted before it confuses any more young filmmakers. The only consideration a filmmaker should have between mirrorless and dslr is also the only difference between the two cameras: do you want an optical viewfinder for stills. Which, if you are a filmmaker and not a professional photographer, doesn’t matter.
FYI Tascam and Juicedlink can't enable the headphone jack during recording due to patent issues with zaxcom, that's the reason why neither feature wireless monitoring.
Ps: I love my Juicedlink little darling, it's built like a tank and I especially like the remote for wireless start, stop and slate.