But last season, I thought Barcelona was still quite effective in capitalizing on every opportunity they created. As a result, their goal production increased significantly.
No, they just create more big chances, and that gives them the upper hand to win games, the art of being wasteful

didn’t just start this season. In fact, it was one of the reasons Inter knocked them out in the UCL last season… they had enough chances to secure the lead and finish it without extra time, but they failed to take even two clear chances. Same with Atlético in the Copa del Rey semi-finals i think, they wasted so many chances but luckily won the game. If they don’t fix this and come up against teams that can use their chances well, like Atlético Madrid, and still has strong forwards then they could be in a lot of trouble, just saying…
Can we really call that wasteful? the only problem that Barcelona has is their defense, their attacks are very effective. Inter Milan knocking out Barcelona in the Champions semifinals last season was just mere luck, if not both teams pull out a tough match and Barcelona had better chances of advancing to the finals but got weakened by the carelessness of their defenders. Barcelona is not wasteful in terms of goal scoring opportunity, is just that they create too many loopholes for their opponents to maneuver them most times, but their strikers are very active and makes good use of their chances. Atletico Madrid does not even have the stability to withstand Barcelona because looking at their performance as the season started, it doesn't look like they can really pull up a tensed match against Barcelona.