The major problem I have with most of these videos, specifically the first two or three, is that the practiones leave their heads unguarded for long periods of time and while throwing a strike. This may work with someone making the same mistakes, but not against a fighter who doesn't.
The long, looping punches and strikes can work and are a staple of CMA, however, there is way to much posturing and wasted movement rather than keeping a good base and working from that. Also their heads are completely exposed in many instances and someone with good straight blast techniques would take their heads off.
The other videos are simply one step sparring and the last looks choregraphed, albeit with the same problems the first few have. I don't understand why Kung Fu practioners still believe their fighting has to look like a Shaw Brothers movie.
"The hero and the coward both feel the same thing, but the hero projects his fear onto his opponent while the coward runs. 'Fear'. It's the same thing, but it's what you do with it that matters". -Cus D'Amato