For me, the best way to get into understanding the DOA6 ground game was to compare it to Tekken 7's (At the most basic level, without all the Spring Kick Front Roll Dive BS) and see what the similarities were.
In Tekken 7, it doesn't matter how many times you have been hit on the ground. If you don't choose to get up, you won't get up. This is currently similar besides a certain variable for DOA6. Nobody wants to get hit on the ground that many times, so instinctively after one or two ground hits a player will usually tech. I can only assure you that this will be the exact same case in DOA6 even without the inclusion of universal FTs. Nobody will willingly watch themselves be hit by Zack's 2KKKKK and say "Yo I just ate 4 kicks on the ground, lets just stay here" No, they're gonna say "Oh fuck why am I being hit on the ground" and they're gonna tech. The Tech Roll and Back Roll in T7 are the two easiest ways to get up in the safest way possible. Same case for DOA6? Most likely. If there are less iFrames in DOA6 for being downed, it will be the incentive to get up without doing WUKs as now they're easier to interrupt/counter than before (As seen in multiple videos) and on top of that you want to mitigate the possibilities for eating unnecessary damage.
If you're the attacker, you'd be wary of what they're going to do on the ground so you'd create a neutral situation by spacing to getting out of WUK range, or hope that the person on the ground would make a mistake you could read/capitalise on/both combined. You wouldn't want to run in, make a trash move and then accidentally turn the tides. With FTs in DOA5, it was always the attacker's turn. In DOA6, the person standing is still at an advantage, but now the person on the floor also has a chance to make decisions that will defuse the negative situation they're in. And there will most definitely be FT setups in the future. I'm sure this is the direction TN is going towards, with their own specific twists to the game. And I'm sure it will work properly.
DOA6 can't have stun-launch, amazing evasion AND a ground game with loads of guaranteeds like DOA5. The game would have no damn neutral lmaoooo