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…
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…Finally, someone who really watched Barcelona. Last season, Barcelona created chances for fun. They created enough chances that they could have scored at least 5 goals in all their matches if they had converted the majority of their chances. People just see that "Barcelona won 3-0", but they didn't watch the game to know that it could have been 5 or 6.
They were too wasteful in attack. Players like Raphina, Lewandowski, Fermin Lopez, Ferran Torres and Yamal (in the second half of the season) missed so many chances, but they mostly won because they create chances in abundance.
It will be the same this season. They will miss so many chances as they have already done in the first 3 league matches of the season. What can make this season bad is if they don't create as much as they did last season and if they concede goals more than they did last season.