Good question,  think it really depends upon the vehicle, my 2000 and 2013 Silverado trucks had zerk fittings on ball joints, tie rod ends etc.  I was never a fan of the sealed unit joints.

Like Tom said it depends on which one, our 2003 Corvette with 207,000 miles still has all the original ball joints and tie rods, that are not serviceable.The one you can grease will last if they are serviced like they should be.

In the early 70's I can remember some new cars coming in for an oil change and lube that had little plugs instead of fittings. We would have to install zerks to grease it the first time. Don't remember what brand of vehicle was like that. My 06 Chevy truck has them but my wife's 08 Cadillac does not.

Thanks, Pete

My 87 does not but many of the joints have been replaced over the years.  I have found that many replacement parts may be sealed for life when the orifional was not for the more modern cars.