>Ultimately the voters of her district have to care.

Pelosi's district interest is against action against those companies.

In this case, she's doing exactly as she's elected to do.

the voters have to care about stock trading by legislators

Initially mis-read this (thanks dyslexia) as "warren rips up bill to ban stock trading by lawmakers" haha (clearly I was thinking of Pelosi)

Barring lawmakers from investing in equities seems like it would be another barrier for non-wealthy people to be politicians.

EDIT: Why the downvotes? Middle class people use the stock market for their retirement funds. If you take away this ability or you take away the salary of lawmakers, you are restricting it to people who are already affluent.

As the article explains, the proposed ban is only on individual stock trades. As a US leader, investigating in broad US market indexes is sufficient for preserving your middle class wealth.