27 here, back to university too for similar reasons and seeing the same thing.

I don't actually blame the lecturers or teachers. A huge part of higher education is self motivated learning with access to people who are incredibly knowledgeable, who also happen to be your teachers / lecturers.any lectures are there to guide the topics of independent learning.

Until a certain point, the purpose of most education was education itself. The matter half of the 20th century into today has seen a shift of the purpose of university being for employment on the other side. This is an enormous difference, it no longer appeals only to people who are passionate about the subject. If 70% of the lecture theatre is there not to learn but graduate, it changes the learning itself. People by nature want to optimise their tasks to get their goal; if the goal is to be as educated on the subject as possible, then you're motivated across the board. If the goal is to get a job and the degree is a checkbox in the process, or even if you're going because "that's what you do", then the motivation is to pass. There is no bare minimum to learning, there is to graduating.

The goalposts move on difficulty too. Universities are for-profit companies, who sell qualifications. Inevitably the difficulty of the qualification will creep downwards, as the expectation of difficulty from the learner does the same.

I think this has been happening for long enough that in all but the most prestigious or passionate corners of higher education, the staff and teachers also first entered higher education in establishments where everyone was motivated by either employment or profit.

Don't get me wrong, I do believe plenty of people in higher education are motivated by education for the sake of it, but it's no longer the default expectation.