At first I didn't understand why the Champions League changed their format, but after I thought about it, it seemed like this was done so that the competition would become fiercer and there would be more matches like the domestic league, even though I actually don't know how the matches will go.
It was first about the next World Cup, now, it's the UCL and I believe one of the reasons they resorted to the current plan is for it to be more competitive and not the situation where some clubs will not be able to meet measurable opponents due to a few mistakes or as a result of the prepared initial 4 grouping that did not favour them as we initially know. By this current plan, the underperforming one will still have the chance to be in the next 16 if they can retrace back their weakness, and by this, they will have the opportunity to meet the teams that wouldn't have been possible with the old format. For me, this is better as it is like mixing the contenders more effectively and giving them a better chance.
So, a team that goes from group stages to winning it, could make more money this way and the whole point of super league was to pit great teams vs great teams and make more money that way, which became reality here with new system of UCL as well. Records will be tough to hold now, some player may score a lot more goals now compared to past because there are more games, so it will be like "record before change" to keep mentioning the old ones.
A team could play enough to make a player score like maybe even 20 goals, which hasn't been done before, could be done this time around because we have so many games. UCL will make a lot more money from all the added games too, the TV rights will be HUGE after this, and I think we are going to see these top teams getting enough to keep them happy as well, should be enough at least, they can make make more and pay more to players and increase their gap.