It's not that simple. All those democratic actions for H1B you've described are merely tokens when you consider how much attention they paid to undocumented immigrants (DACA). They've completely neglected the kids of H1B workers who have been here decades but have to leave the country when they turn 21. None of what they've done provides an attainable pathway for permanent residency for legal, tax paying high skilled workers from India.

Democratic immigration policies always prioritize family based and undocumented immigration. They have clear electoral benefits from this (see AZ and TX). Reforming H1B and the high skilled immigration system is only an afterthought.

Republican policies have at least put forward some kind of points-based system. They however want to reduce family based immigration which is an absolute no-go for Democrats.