Sponsored editorial content. IOW, Spam.
Clutchless shifting on a bike w/o an autoclutch or other factory speed shifting system requires some mechanical empathy and is a learned skill. Understanding how much to unload the transmission before shifting w/o forcing things and causing extra wear can be a trial and error process for a newer rider and done wrong can end up with damage that is expensive to fix.
Since using the clutch lever takes so little effort and time, most riders are best suited to actually using the clutch. You're not on the race track, no one cares how fast you change gears. Save some potential wear and tear on the transmission and use the clutch. It's expensive to repair.
The OP is correct that
Done smoothly, itís no harder on your gearbox than using the clutch.
Failing to mention that if it's done poorly, you can end up splitting the cases to replace damaged gear dogs or shifter forks.
Yes, I can shift smoothly w/o the clutch. No, I don't shift w/o using the clutch. Why? Because there is no reason not
to use the clutch. Especially on a 100+ Hp motorcycle. It's a good skill to have in case you suffer a clutch problem on the road, but just a gimmick the rest of the time. Or laziness.
After 500,000 miles of riding motorcycles, I still use the clutch every time. And I've never, ever, had to repair a transmission, even on bikes I've put well over 100,000 miles on.