Thought I would try and figure out if Slovan Bratislava are one of the teams to have benefited from the expanded format. As it is their first time in the Group/league stage - you might think that it is. But, they have been steadily improving - from 1st Qalifying Round to to 3rd QR in previous years and in this years Play Off they played Midtjylland who were seeded above them, qualified as Danish champions - therefore finishing above Copenhagen who have regularly played in CL Group stages. That suggests that not only have Bratislava been improving but they worked their way to this stage on merit.
In the previous years the teams qualifying through the Champions path were Galatasaray, Copenhagen, Antwerp, Young Boys. - of which Antwerp finished 4th in group, Galatasaray and Young Boys 3rd and Copenhagen 2nd. Which might suggest that teams coming through that route deserve to be there. Of those only Young Boys have qualified this season.
This year the qualifiers are Young Boys, Dynamo Zagreb, Slovan Bratislava, Red Star Belgrade, Sparta Prague - of which, so far, only Sparta Prague have any points. Which suggests that these remain the teams who will fail to go any further in the competition. Yet, it can also be a chance for them to shine and improve - I'm sure Sparta Prague fans are enjoying it so far and wondering just how far they can go.
It's hard to know for sure - but I suspect Slovan Bratislava were playing well enough at the Qualifying Stage that they could have qualified in the previous format - but then they would have faced the same fate in a Group stage and found themselves the whipping boys. In this format they get to chances to play teams ranked similarly to themselves and four opportunities to see them play former European Champions. I suspect they will enjoy it whilst they can and then win their own league again to give themselves a chance a of improving for next year,