Presidents are elected based on promises made to various parts of the electorate, and if/when Congress won't act (often even when Congress is controlled by the president's party, nearly always when controlled by the opposition), no one generally makes a fuss if the president pushes through a popular-ish thing by executive authority. Republicans may be happy now but they won't be when a Democratic president ups the ante in a few years, just like Democrats were perfectly happy with Obama and Biden's overreaches but are furious at Trump's.