I can not aggree with anything you say. My main machine is an A3000 equipped with a warp engine@40MHz, and it's kicking like crazy horse since the day I got it (one and a half year ago, from a member of this board actually). I dare not play with the configuration very much, because of the basic rule, if it's working, don't mess with it ! I will only open it again to install a Cybervision64 when I get one. And maybe to change the caps. I'm not sure about the caps though, somewhat risky business ...
bottomline, a3000s rule. Amigas with the smd caps give much mroe problems than old through hole component boards.