True that you may have to dig deep if something major goes wrong if you can not DIY för 10h+ if needed. I have original starter , original EGR pipe and original power steering pump on my 1995. Do not look forward to when those needs doing. My 2000 has had the starter done by previous owner and does not have a EGR pipe. Has needed some hole patching in the exhaust done though.
However If you compare to other luxury cars like Old BMW , Caddilac STS, Mercedes, Volvo the LEXUS LS400 feels much less at risk for expensive part outlays.
Another benefit of my old LEXUS cars is low insurance cost for the mandatory liability insurance here in Sweden. I pay 150£ per year and then also get theft, roadside assistance and a accident insurance for occupants.