I'm undecided.
One benefit of this strange new "Swiss" system we've ended up with is that the matches further on in the league stage will mean more. It does at least force teams to play until the very last minute of the round really. That last matchday in January is gonna be chaos - you're potentially looking at a night where roughly 15-20 teams could change position in the league, either dropping out altogether, requiring a play-off, or going through automatically. And even the teams who are already through will be playing for first and second and third, etc. to improve their chances of getting a better seeded draw in the knockouts. It has its benefits.
On the other hand, it's pretty obviously a concession made by UEFA to the Super League clubs to give them more TV revenue and more of a chance of getting through anyway. Say PSG struggle in their league fixtures (Arsenal, Atletico, Bayern, and Manchester City for them) and finish in 17th place. No problem, just give them a play-off against a weaker team who got a relatively fortunate run of games in this league bit (say, Celtic) and finished in 13th - boom, easy PSG win over two legs and through they go. FOUR more games of TV revenue and potentially SIX more games than they would have had if they'd struggled in the old group stage.
The same goes for us really. We'll likely end up with 15-20 points from these games (Inter D, Bratislava W, Sparta W, Sporting W, Feyenoord W, Juventus D, PSG D/L, Brugge W) which should be enough for a top eight finish, but if it's only enough for a 10th place finish we'll likely get drawn against someone like Monaco or Stuttgart anyway. Just feels like there's a real lack of jeopardy for top clubs because they know even something as low as a 50% win record is enough to at least get them a knockout play-off. In some ways this just exacerbates the problem from the group stage where nine points was usually enough to go through in 2nd.
What UEFA need to understand is that consistent excitement only comes in knockout games, and even then it's only really second legs where things go crazy.
But no matter how much twiddling and fiddling they do, they'll never accept that a 32 (or even 64) team tournament with straight knockouts in every round is the most exciting format because the most exciting format isn't necessarily the most lucrative, for shareholders and the like. The traditional format was fine. Even the 21st century Champions League format (groups, Ro16, quarters, etc.) was fine, they should have just made the groups shorter to increase the jeopardy and variety of teams getting through. As it is, it just feels like we're taking longer to get to the same point. I think this new format has its merits and they'll become clearer as the league goes on, but the jury's out.