Are conservative Democrats useless for the Democratic Party?

[Hardkill]

You know, I am really beginning to think that conservative Democrats like Joe Manchin and Kyrsten Sinema are useless politicians who haven't helped out their Democratic Party in any significant way. I mean, yes Manchin and Kyrsten have helped the dems confirm Biden's cabinet picks so far and yes they also did vote along with the entire Democratic Party to convict Trump for both his first and second impeach trials. However, Manchin and Sinema never really did much else or haven't really tried to do much else to help all of the Democratic congress get a lot of things they want and need to get passed for the greater good of the US. What do you guys think?