You're right Barcelona would've been a good match for the finals and it would've been a bad one for PSG, PSG should be very happy that inter eliminated Barcelona if not it would've been a stumbling block for them because PSG and Barcelona have almost the pattern of football and mind you that's a finals which I know that Barcelona will not joke with it, they would have given all they got that day to make sure that they win PSG, to me despite how PSG is, Barcelona remains their superior unless such has to be proven wrong this time by both of them meeting in finals of such competition like the UEFA champions league.
It would have been a tough game for PSG if they were playing against Barcelona in the finals. Barcelona has a stronger squad that is capable of challenging PSG. If Barcelona were to be in the finals of the Champions League, it would have been a privilege that they would not have allowed to be missed easily, and PSG have also been looking for a way to win the Champions League trophy. The game would have been tough, but Barcelona would have had better chances of winning.
Unfortunately, it is not Barcelona who will be PSG's opponent in the final, but Inter Milan, and I think that means Inter Milan is better than Barcelona at that moment. If it were Barcelona, I think they would not necessarily be stronger than Inter Milan, or could give PSG a tough fight, because mentally they are not better than Inter Milan, and it will be the first final for their young players, which could put a lot of pressure on them.
Whether it's Inter Milan or Barcelona, I think PSG will still be the champions because they are really strong this season. Luis Enrique really made a very significant improvement, and PSG has grown a lot with him.