I have been banging on about this for a while, because this is such a concern. For starters, our local uni accepts BTEC Applied Science for a wide range of courses from healthcare to conservation. They don't accept T-level science at all. For anything. What's the point in offering students a qualification that isn't going to offer them the progression they want?
Obviously I know not everyone wants to go to the local uni, but many of our students do put it down as a choice, and cutting off that progression route would need serious consideration.
We are rural, and many of our students come to us on the bus. We can't arrange transport for individual students to work placements- so how would they get there (and that's if suitable placements can be found)?
We also know from local colleges who have trialled T-levels in our subject that it isn't as well suited to the sort of students who succeed on our BTECs. They trialed T-level Science, and decided that students who were e.g. retaking English or maths couldn't succeed on it. This is exactly the sort of student that BTEC Extended Diplomas suit! AFIAK, they aren't running the T-level course in science this year.
We have had great success with our extended diploma route over the years, with students going on to careers like nursing, radiography, environmental science, geology, lab technicians etc- things that are genuinely useful to society and sometimes shortage skills areas. That's not the only value in a Level 3 course, of course, but some students struggle with exams for all sorts of reasons, but can still be successful in life. Some students aren't suited to A-levels, or had a hard time during their GCSEs, but can do well on a BTEC.
I also don't know what else these students would do locally- there aren't enough apprenticeships to go around, and the local vocational colleges don't offer the sort of course that would interest them.
I don't understand a government who say they want more students to go into STEM, but take away a valuable progression route!