No, the main barrier is concern over warranties for the vehicles.

In California, the law requires that vehicles still hold up to 70% of their original charge after 8 years and 75% in the future [1]:

> and d., to deteriorate to less than 70% for a warranty period of eight years or 100,000 miles, whichever first occurs, for 2026 through 2030 model years, and 75% for a warranty period of eight years or 100,000 miles, whichever first occurs, for 2031 and subsequent model years.

The law is unclear on bidirectional charging and whether this would give manufacturers an out. So they're cautious.

[1] https://www.law.cornell.edu/regulations/california/13-CCR-19...