Manmohan Singh was seen as exceptionally spineless (because he pretty much cowtowed to whatever the Gandhi family said). That’s not how Biden is perceived. At all. Biden has installed more justices than Obama and Trump combined. He has done it without the right freaking out about it. He has been incredibly effective if you delve past the surface.
In right wing circles Biden is often perceived as a puppet for 'elites', too old and senile to make his own decisions. Every other tweet about him seems to get people joking about how he had to go to bed early or how they had to drag him out to make a speech. I was a bit young to carefully follow Manmohan's term, but I recall that one of the comments I often heard from adults were that he was clearly too old for office.
It's funny how his speech is an indicator that he is too old for office, when his opponent's speech is so frequently and completely unhinged[1], that it sounds like a self-parody.
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> [1] I have broken more Elton John records, he seems to have a lot of records. And I, by the way, I don’t have a musical instrument. I don’t have a guitar or an organ. No organ. Elton has an organ. And lots of other people helping. No we’ve broken a lot of records. We’ve broken virtually every record. Because you know, look I only need this space. They need much more room. For basketball, for hockey and all of the sports, they need a lot of room. We don’t need it. We have people in that space. So we break all of these records. Really we do it without like, the musical instruments. This is the only musical: the mouth. And hopefully the brain attached to the mouth. Right? The brain, more important than the mouth, is the brain. The brain is much more important.
Yep, it's pretty ironic, the only difference between the two (in terms of showing their age) is that Trump is more energetic (animated?), but energy doesn't translate to coherence.