The earlier machines had much higher quality capacitors that are mostly still OK afaik. Consensus (if I may be so bold as to try to represent it) in the Amiga community today is: definitely recap the later Amigas (A600, A1200, A4000, CD32) with their cheaper SMT caps that usually leak and slowly destroy the motherboard, but A1000* and A500 usually don’t need it.

*The caps on the motherboard, anyway. I am not sure about the durability of the internal PSUs. I haven’t bothered to replace anything in either of the A1000s I acquired recently.