I must admit that Barcelona is indeed a team with great young players, quality and very professional at their current age. So their chances of qualifying are even higher, only when remembering Liverpool makes us also have to remain rational that how threats and unexpected things can come from an underestimated team. Dortmund is indeed not a team that can give Barcelona difficulties but that doesn't mean there is no resistance at all. I am sure that apart from Barcelona promising chances, Dortmund must prepare everything to stop the ferocity of Hansi Flick troops.
Barcelona's chances of beating Dortmund are indeed great because in terms of quality their team is much better now, but don't underestimate Dortmund because in La Liga Barcelona also experienced defeat when facing a much weaker team. There are always surprises that will happen and generally how a coach can see opportunities to create victory for his team and if it cannot be seen properly it is not impossible that they will be defeated by Dortmund's coach strategy.
We can learn from Liverpool because in terms of quality and strength they are much more likely to beat PSG but that did not happen, even though Liverpool's defeat in the second leg was determined through a penalty shootout scheme. This is also a consideration for Hansi Flick because when this happens, the mentality of the players is very much needed.