Why you may ask? Well they are now updated versions to 1360 power cap with the Arrivals logo. Also they are nice rolls that may or may not drop after the event starts. Plus they are also already masterworked which is a bonus. Yes they are only 450 and not 600 rpm but still solid weapons. Disappointed to lose my kill trackers from the old versions, but that seems to be the theme going forward.
More info here :
[url=https://www.forbes.com/sites/paultassi/2020/10/02/you-need-to-pull-destiny-2s-festival-of-the-lost-weapons-from-your-collections-right-now/][/url]
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There is no harm in pulling one and banking it, but generally Bungie have given us the ability to keep static rolls as pullable from collections. I imagine the "new-current" versions that drop for this coming event will appear in collections as a separate entry. There has been a shift recently in how Bungie manage our collections long term now it's an established concept. Take Redrix's Claymore, we can now pull the static model but it may be added back into the loot pool later. As I say no harm in pulling one just in case but I wouldn't be panicking :)