The way sunsetting works is basically in-game items get a max power level that goes to the power level that will exist 12 months in the future from the season it dropped in. That is why everything from Forsaken is capped at 1060 because Beyond Light will be the start of year 4 and Forsaken-era gear are all year two, so they would be capped at the max power levels introduced in Shadowkeep.
Bungie did make a late exception for the raid armor where that would be allowed to be infused up to the max expected at the end of year 4.
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We have the "Forsaken" armor, which is no longer relevant as well as the content of "Shadowkeep" since "her year" is over. Nevertheless, we have some of the content of the "warmind", which will be totally relevant for 4 years. I got the Curse of Osiris and Warmind add-ons for free, but the Shadowkeep and Forsaken add-ons were purchased last year and I am faced with the fact that all the content I bought will turn into candy wrappers at the end of the year due to a number of reasons. I can sincerely understand the disappearance of very old add-ons, the content of which has been mastered up and down, but the very fact of sunsetting PAID add-ons I absolutely cannot understand. Should we expect an "update" to the armor and weapons of these additions next year?