I think that's a pretty fair question, especially as I am kinda globalist (or at least see majority EU cooperation and correcting itself as a net-good)
if we take aside potential hoping-to-weaken-EU Russian involvement, and a lot of its de-legitimizing language, my very first concern would be making it harder to enforce common standards for instance to prevent democratic backsliding, as I see European democracy as being the best tool currently for results that both allow experts to weigh in and for the nuance of public concerns that spontaneously emerge, even if we all can argue that it will always need improvement to a lot of people.
Heightened unanimity requirements hold a lot of the union hostage, when it in general would be nice to be on the same page, but I understand it also shouldn't be so low as 60%, I would argue that current standard or maybe a tinge less is fair in that it tells you that most everyone is on-board with a decision (simplifying a lot of how the people making the final decision got in power of course, where there are maybe half of their citizens who could still oppose whatever they voted for)
So far this has helped a lot in human rights protection within the EU, collective bargaining power with the outside, enforcing a climate policy which pretty much requires everybody to step up, and like, other things that in the short-term can make for instance authoritarians be very popular at the cost of the long-term.
Yeah but it'd benefit the administration at least, I'm not saying it'd benefit anyone else!