There's no shame in losing to two of the best players in the league if it goes that way.
No shame in losing, the shame is in constructing the roster so poorly. Playoff minutes for Dallas defensemen are:
Harley, LHD, 17g, 441mins
Lindell, LHD, 17g, 401m
Ceci, RHD, 17g, 361m
Lyubushkin, RHD, 14g, 238m
Petrovic, RHD, 16g, 205m
Bischel, LHD, 17g, 201m
Heiskanen, LHD, 7g, 149m
Dumba, RHD, 0g
Lundkvist, RHD, 0g (Injured)
Smith, RHD, 0g
Smith was only ever a roster filler. Petrovic has been the same, playing in AHL almost all of the last 2 years, but he's eaten up a lot of valuable playoff minutes in that same span of time. He has 6 season appearances and 23 playoff appearances the last 2 years. Petrovic getting playoff minutes is a damning indictment on the entire roster but specifically a few, maybe just one, very hated player(s).
Lundkvist being injured is a shame, but he was yanked in the playoffs last year and Petrovic was given minutes instead. Lyubushkin has been ok, but healthy scratch in a few games this playoffs because really he's a 3rd choice at best. Cody Ceci has been really good but asked to do too much since the trade. He should be a 3rd choice RHD but has been needed to do more. I can't blame him for not being good enough, he should be good enough to skate 10-12 minutes per game but he's logging 21:30 ATOI and that's too much.
I can't really say how bad Dumba has been except that he played 63g during the season and 0g this playoffs. He has zero trust from DeBoer and it's entirely warranted. He was a terrible FA signing by Nill and should have never joined the team at all. And we've got 1 more year of his trash/contract to endure.
The Miro injury was unfortunate but those things happen, except that it was a really dirty play from Mark Stone. Miro can play RHD, he's played that half his career, and the Stars can be really good with him putting minutes there. Bischel is young and still makes a lot of mistakes but he has a future as an NHL defenseman and can eat playoff minutes. Biggest problem with Bischel is who to partner him with. You don't want to put him out there with Ceci because that's too much liability, but then do you partner Ceci with Harley or Lindell instead?
Possible pairings:
Lindell - Heiskanen
Harley - Competent NHL RHD
Bischel - Ceci
That group is still getting exposed on the road but at home you can protect the 3rd pair. Or you can roll Ceci with Lindell or Harley and roll Bischel with Competent NHL RHD and have 3 solid lines, but you still need someone capable to mark McDavid, which is an impossible task to begin. It's all a frustrating clustermess and fan anger is warranted because this is actually a good team. You can handle dry spells from Johnston and Robertson if the defense is capable, but this adds too much stress to everyone.