I dunno, I just used a brand new feather in my brand new timeless open comb with a .95 blade gap, and my face hasn't been this smooth in 46.5 yearsfeather blades are extremely sharp out of the package, but a lot of people find them to be rather harsh on the first shave. They are a little smoother on the second shave, not quite as sharp, but still very sharp. After that, depending upon the coarseness of your beard, they start to deteriorate. I have a tough beard and and get three shave from them before they become uncomfortable. I won't use Feather blades in a very aggressive razor such as the Muhle R41 because they are too harsh on my skin during the first shave.
If you are looking for very smooth blades, then your one shave per blade is perfect as long as you avoid Feather blades. If you are looking for an extremely sharp blade and are less concerned about smoothness, then using Feather blades for one shave might work for you. However, most folks want a suitable balance of sharp and smooth.
If you have never tried your customary blades for more than one shave, I would suggest you do so. Keep using them until they start to feel harsh or start to tug. You might find that they perform better on the second shave than on the first. You might even be able to use them for a week or more. It all depends on your beard type and your skin sensitivity. It does not matter others do; it only matters what works for you. If you try multiple shaves on the same blade and find that the quality of your shaves deteriorates, then go back to one shave per blade. Each person is different.
If you have more than one razor, you also might find that different blades work better in each razors. I use very sharp blades in mild razors and medium sharp blades in more aggressive razors. Try different things until you figure out what works best for you.