"Students" are then sorted into a lab where they learn the specific scientific cookbook of the subfield and in some cases never even try to apply it truly on their own before graduating, because they are used as a lab monkey for 4+ years. Collaborative side projects or substantial additional course work are rare, so students are often functionally the same as a lab employee.
The lab has minimal external incentive to train the person to become a good scientist, and there isn't much cultural pressure either, so the training focus is instead to become a good [hyperspecific topic] lab member.
To graduate a student needs a deep understanding of what was previously shown in their niche, but they really do not need to engage with much at all to do with meta science, and it is wholly possible to graduate without ever demonstrating the ability to ask good scientific questions from the genesis of a project through to it's completion, even in the context of the norms of said niche subfield.
Student experiences of course vary widely, and even for those that do the menial slog version of a bio PhD, the attitude surrounding it varies. Some seem to be happy for the guidance when their advisor is like this while others resent the lack of intellectual freedom.
Regardless, I find this to be pervasive in the environments I've been able to observe, even at a few of the supposedly top life sciences PhD programs in the US. To think deeply about meta science in any official capacity as part of PhD training requires you to go out of your way.
Meanwhile on the other end of the spectrum it is possible to receive a "top" PhD and stay in academia for quite a long time through only a combination of hard work and learning the experimental best practices of the field as if it were a trade (and that might be underrating the nuance in the trades honestly, I don't know enough to say).
I do think it is a difficult problem to avoid to at least some extent, because open questions in biology increase in complexity quite a lot over time, with a big time and financial commitment required to do a number of projects these days. Without radical changes in labor sources for wet lab work I'm not sure the issue can be sufficiently addressed.
I also imagine that even in less expensive/slow fields there is an increasingly unapproachable body of prior knowledge to learn, and people don't want to be trainees forever. So I believe a large philosophical paradigm shift might be needed too.
I'd love to see multiple different types of PhDs introduced with different graduation requirements, funding structures, and intended postgrad career paths, while maintaining the core thesis writing experience across the board.