Ah come on, even you know that's absurd and borderline stupid. The issue was not obama himself. This isn't an issue of obama not being friends with republicans. The republican party did radicalize under obama but that was never because of stuff obama did, this started the moment obama won. And the accusations of obama being a communist and whatnot started even earlier. And those weren't even fringe parts of the party, it was just mainstream republicans doing what their constituents wanted. Why do you think it was such a stir when Mccain said obama was indeed an american who loved america? Because the party has gone mental and through McCain you had a tiny shred of sanity coming from the party's fringes...
And that said, democrats never play tough... They always rule out every tough alternative they had to actually counter stuff that trump did. The perception that democrats fold at every chance is pretty clearly rooted in reality.
Republicans were obstructionist during the obama era simply because this is what they constituents wanted and it's extremely likely this will remain unchanged in the Biden era. A majority of the republican party still believes biden lost the election... do you suppose that will make republicans less extreme? Even now you had over 100 congressmen and plenty of senators going along with this election fraud nonsense.
It IS an issue of Obama that he was unable to strike deals with the republicans. Deals are not about niceties, deals are about finding some consensus that is mutually beneficial.
Obama was often not able to do that with republican lawmakers, governors or other relevant figures. And Biden is a different person than that. For example, without any niceties, if you understand how someone ticks you can convince a republican lawmaker who is on edge that a decision will be beneficial for his reelection. If your pitch is clearly better than mc connel's and the guy actually is not a fan of the policy, that can work. Not because he likes you, but because you found something to hook him with. Obama was never a person who could deal with stuff like that (with the human side of it).
Seeing the republicans and their voters as a block of people who works outside of the human psychology is ill advised. Yes, a lot of republicans are downright fascists, more of their voters are. We don't need to repeat that over and over, you know that, i know that. Still, you need to deal with them. Nothing changes that. And right now, the republican party is on the fence.
If they purge themselves off Trump, a third of their voters and possibly lawmakers will be gone. That will break the party in half.
If they don't purge Trump, the same might happen with moderates who will not vote them anymore or break away from them (and it is insane).
So their decision right now is that singled out voices say Trump is not a good guy but the reaction is overblown so they both cater to trump fans and assure moderate that they are not completely crazy. The democrats can influence that reaction. The democrats can force them to stop this 'i endorse trump and also dont endorse him' kind of position if they play their cards right.
But just seeing the republican party as enemy and not as a potential partner that can be convinced to do something more beneficial to the democrats than they are doing now would not be productive. It might make it impossible to get the country back on track.