First of all, I apologize for this getting so off topic so I'll let this die here.
funny considering im watching the tekken championships and im rarely seeing anyone juggle with it.
If you want the tl;dr or proof so as to avoid reading most of this then look at my links below but I explain the whys and situations in full to further clarify things hence the length.
While I commend you for actually bothering to research a video, please always compare and contrast as opposed to use a stand alone video or person because there's always several reasons why players do things differently from others or what is seen as the best thing to do. Fact of the matter is that most Mishima players don't go for the most damaging stuff consistently due to the execution barrier being insane and not that reliant for them.
In tournaments, especially high stakes, that's a big no no for most of them unless they want to style or just feel hot. Mishimas also tend to drop more than others at high level which is just accepted as the life of a Mishima player even if they go for the simpler stuff due to the required execution. If Mishimas for example knew they could hit ch d/f+2 PEWGF nearly every time, they would never fail to go for it because that damage is ridiculous. That's what is most important to note because just because it's not done doesn't mean it's not the most damaging option. Even Raidou doesn't need his electric but it's obvious he's better with it and you maximize it the more you use it in his follow ups.
T7 has also changed some of the EWGF dependency making it as of now the least needed it's ever been outside an initial launch due to system change as they tend to mess up max damage combos now due to tail spin. It might change in the T7 update but no one outside Japan and Korea can play the game right now outside promotional releases anyway. Watch TTT2 or even (lol) Tekken Revolution vids insead where they're still as needed as ever and you'll see at least two in the highest damaging combos.
If you're talking about the past global championship, then yes Knee played DJ and that is his third best character. Bryan his number one and in T7 Shaheen became his number 2 or maybe even his new number 1. Despite being arguably the best at Tekken with Bryan over the past decade, he has never been a Mishima specialist and was rarely ever a terror playing Kazuya or DJ which has almost always gotten him blown up against people he blows blown up when he uses his true main.
Knee getting into global championship grand finals with his at best 3rd strongest character is ridiculously telling just like the other times when he plays one of his subs in tourney and places top 8 or grand finals. Knee is just that that good overall but it's sad when he gets blown up doing that when you know he could have just picked his main and very possibly won. According to him, he just likes to test different characters at times.
Anyway, his DJ was sloppy as hell in the global championships with all of the dropped electrics (and other combos) and you see him give up doing the more advanced combos due to dropping even the first launcher too much. He wouldn't even do a WS+2 EWGF follow up despite that being DJ bnb as he opted for the simpler lower damaging combo follow up instead most the time. Even the commentators (Mark Man and Aris) questioned what he was doing a lot or what was wrong.
It was hard to watch given the Mishima specialist like one of his biggest rivals, JDCR, rarely ever drop like that even when they do the advanced stuff. It's also worth noting that DJ despite also getting his biggest damage from EWGF (pre T7 anyway) is not as dependent on it as Heihachi and especially Kazuya is since has has far more tools than both. Kazuya needs it the most by far since he has way less tools than both and less ways to follow up from launchers too.
This post is big enough already so I didn't want to go out of my way and give even more huge amounts of info and links to make it two or three times as long so I'll just leave the ones below. I really just wanted to explain the situation brought up which had a lot of areas to cover hence the length. If you're interested further then inbox me and I'll follow up there.
Most of this has been done in actual matches by various players so it's not just for show.
Here's some of Kaz's max damaging juggles in TTT2:
Here's some of Heihachi's:
Here's some of Devil Jin's: