Game for the most part is well balanced for solo.
The bosses are not so difficult that you need others to draw aggro or anything <thankfully>

Game honestly feels a lot less of a grind post H&H due to pickax and resource mechanic changes. Food seems less of a grind... drop rates are good and food lasts longer so you don't need as much. They also added more food so you don't need too much of each item before upgrades have you looking for new stuff anyway. <easier to manage unless you are a hoarder>

I would say get the game now and enjoy it for what it has. But remember it is an Early Access game and could change a lot before full release. If they do end up changing it and solo becomes super difficult/ impossible at least you can enjoy it now for what it is.