Not every year, but they said it was no problem if you wanted to halve the benefit halfway through or even a second time after that (and they would lower the premiums commensurately of course).
I have Principal and Protective in the US.
Scolding people for not giving you more than they already gave you for free is a behavior that will never get you what you want.
Update: eh, I'm in a good mood today so I'll tell you the name, it's Ladder. No link though. You may Google it as penance for being annoying.
Are you sure that Ladder offers decreasing benefit insurance? I looked all over their website and found nothing about decreasing benefits. The name "Ladder" might imply the technique, called "laddering", of buying multiple policies to achieve decreasing coverage.
Here's a link if it's helpful! https://www.ladderlife.com/laddering
One agent told me that most customers drop their policy after a few years. The companies earn most of their income from the initial periods of policies, when payouts are rare.