And the process is such a black box that you can get interviews at highly, highly competitive firms and yet strike out at many less competitive firms.Three reasons why i would apply for that firm you're not really passionate about:
1) Going through the process, however painful, will give you experience researching firms and writing good apps. Being good at faking enthusiasm is an underrated skill. If you get the VS, that's also experience.
2) Who knows, maybe if you did some of that research and got to know the firm you'd realise you quite like the work they do or the culture.
3) If you're after a TC, you should realise that commercial law firms aren't that different. It might feel like it scrolling a forum whose literal purpose is to help people differentiate law firms; and sure, they advise different clients in different sectors and have different specialisms. But, at the end of the day, all commercial solicitors do is contracts, companies house filings, court filings, legal research and a bit of project management (at least at the junior end). Like that's it. There is no single trainee task that a trainee at one (commercial) law firm will be taught to do that one at another is not. If you're not interested in a firm because it's small, doesn't have the right specialism, or doesn't have the right culture, there's a thriving lateral associate market ready to pick up NQs.
I did a vac scheme at a firm I was tepid about. Turns out structured finance is cool as fck.
Just my 2¢
You never know unless you try.