Does grinding oneself into dust at a thankless job for a faceless corporation in the name of perpetual economic "growth" at the cost of the entirety of survivable nature as we know it have any meaning whatsoever? Because that's the flipside of what you're saying.
It may not be possible for us to go back to a time before modern technology, medicine, etc (or maybe its more likely than we think), but is it any wonder that so many peoples' brains yearn for something like that? The definition of life may be struggle, as you say, but struggle without self-determination may be the very thing that kills whatever "human" is.
There are some things worth struggling against, but I see no better reason to quit than a pointless struggle.
jk, but seriously, meaning is subjective, and nihilism is a thing. one mans isolation may mean worlds to him, and thats good enough.
also, careful about shaming people for being content with personal happiness...for some thats an accomplishment.
But everyone is discounting struggling for faceless corporate entities that do not and will never give a shit about you.
Because there's more to life than personal happiness. Struggle is the definition of life. It's what gives anything meaning. People have families that they support, and being that thankless workhorse for them ends up being a deeper satisfaction than personal moment to moment happiness. We could all go sit in cabins in the woods and whittle away on sticks until we die and probably be "happier". But if a tree falls in the forest with no one around, does it make a sound? That is to say, does a person in isolation enjoying their own happiness have any meaning whatsoever?