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Not all..https://www.classiclightweights.co.uk/classic_components/harden-bicycle-products/
Been commuting with a set of these for about 6 years 30miles a day in any weather And they have been amazing. Havent had to change the cartridges once. Incidentally the bearings are still easily available as a metric size.
falconvitesse
Bear in mind that all bikes had unsealed cup and cone bearings until about 1980, and millions of them went decades without maintenance. If you want to err on the side of caution, use plenty of thick grease and repack annually.