You usually use LTSpice only to simulate difficult analog parts of a circuit. Not the whole thing.
The important part is the device models that simulate components.
Those do get updated as new analog ICs come out. It's finding a good model that's hard. Linear Technology keeps the models updated for their own parts, but you have to look around on the Web for many non-LT parts.
The important part is the device models that simulate components. Those do get updated as new analog ICs come out. It's finding a good model that's hard. Linear Technology keeps the models updated for their own parts, but you have to look around on the Web for many non-LT parts.