^ I disagree. You do not need STEM ECs to get in for stem (you do need good ECs, though). I went to a US News top 5 (recently enough for this info to be considered relevant). Applied as a math major. Had absolutely zero STEM ECs. Still got in. Many math and science majors I knew did not participate in any STEM ECs in HS either.
Think about it like this. Do prospective English majors need English ECs? Do prospective Econ majors need Econ ECs? Do prospective anthro majors need anthro ECs? Are there even such things? College is not grad school. When you apply, you have to demonstrate that you are smart, but you don’t have to demonstrate any particular skill/knowledge of the field to which you are applying. College is there to teach you that stuff. Additionally, many colleges expect that you will change majors, so evaluating a student on the basis of a major they likely won’t major in is foolish.