"Socially Compassionate" is the term Manchin uses frequently to cover for his support of far left social policies like abortion, the lgbtq agenda, welfare, etc while claiming to have conservative values. As far as fiscal responsibility, he would have enthusiastically supported BBB if they loaded enough bribes for him. With this political move, he ensures they will not underestimate him again. The only thing that surprises me is that Mitch was able to keep the squishy rinos in line.
If lived in his state I'd vote for somebody more conservative, but through the years I've also found that people celebrated as conservative (Dick Cheney, Paul Ryan) have also been wrong and not worth very much.