Judges deciding cases based on what the law says, free from fear of political reprisal is the intended feature. Lifetime appointments get you that (or very nearly to it). If you know of a strictly better way to get the same feature, what is it?

America surely does not have such a shortage of well-qualified lawyers that each justice needs to serve for decades. It's certainly not an argument anyone would accept regarding the President. Just have them serve a single long term, and then that's it.

You might lose some expertise, but on the other hand, you don't have the tragic spectacle of Justices dieing in office whilst waiting for a 'safe' time to retire.

The point about having them "serve decades" is to ensure that a single government period isn't enough to swap out all judges. If a new political faction comes into power they can't after a short term replace all judges with whatever the view of the season is, but only when the movement is established over long period will gain those powers with election in between, which can rebalance.

Taking again Germany as my example, since I know it best: There are 16 judges with a period of 12 years. Adding the age limit and other reasons that averages to about 2 elections per year. Thus a bit more than 4 years till a new group can take over the majority. (Now they are elected alternating by the different chambers of parliament, where one of the chambers, Bundesrat, is also slower moving in replacement ... making it hard for a short term movement to take over control and if, impact is relatively short - unless they stay in power long enough to replace all.

> If you know of a strictly better way to get the same feature, what is it?

Let them serve for a limited period of time, say 16 years max. Can't be removed before then. It's not that complicated and would prevent justices who literally sit on the bench until the day they die.

Yes, they are an issue. The idea is to make them independent from future career things etc. and the rule is from a time where people didn't get as old as these days. This makes them independent from the politics of the day.

I think Germany got that better: here we have a 12 year term (thus a single government can't easily swap them out - a learning from the time of 1933) and a max age of 68 (for whatever reason that was picked)

Maximum age is a great idea. Senators like Feinstein and Grassley should honestly be booted and replaced.

Well, the voters don't seem to agree...

Let them serve a 16 year term on the supreme court, and then return them to a lifetime appointment on a circuit court.

If you make it 18 year terms and stagger the appointments (as grandfathered-in justices die or retire) to every 2 years, you can make it so that each presidential term appoints two justices, which at least removes some of the potential for luck to dramatically shift the balance of the court.

If that were the case, and justices' terms started in January of even years (to avoid the election cycle), we would currently have 2 Trump appointees, 4 Obama appointees, and 3 Bush appointees, roughly matching what the balance of the court would be next month if Ginsburg had died 3 months later.