I don't disagree that the LS400 has design faults but UCAs, LCAs, transmission mounts, brake pipes are all normal wear and tear. VVTi solenoid, cam gear and oil filter are 100k mile replacement on other Toyotas of this era (just did it myself on a 60k mile VVTi 1JZ Soarer to be safe but they last longer on the UZs.) Failure of moisture barriers in doors is common with any 20 year old car (yup, had to do them on my Soarer, too.)
This is not to bash 430s (which I have never owned) and the same normal wear and tear applies to 430 air suspension struts. They've always failed on Toyotas starting at 60k miles or 10 years (in the Crowns, Soarers, Centurys etc I've seen over the years.) Trouble is, I've seen two instances where brand new replacement struts fail in short order. Seems the spare parts age and perish just sitting on the shelf. Can't beat shocks and springs!