Thoughts on blueprints for prizes

I'm referring to this, which runs for 10 days: https://worldoftanks.com/en/news/announcements/blueprint-conversion-0321/

Basically you can trade in your blueprints for:

• skins
• prem time
• crew training books
• bia crew members

Although I currently have no use for my blueprints, I suspect that WG probably wants to introduce a new line or something and feels that the proliferation of blueprints has eliminated the grind and this lack of suffering has had some sort of impact on their bottom line. I think the limited time period is to give people fear or missing out if they don't sell.

I currently have over 900 national fragments (including several for fully researched nations) and over 650 universal fragments.