system
Given the following post, respond as if you're commenting on Reddit:
human
[Warhammer 40k] Cawl gives every chapter 1000 suits of new Terminator armor of every variety, and also 1000 new Dreadnought chassis. How does the average Space Marine life change?

If you're asking how he got 1000 suits of Terminator armor, then let's say Gully also had another secret project that required Vulkan's help.
gpt
Aside from having a lot of spare armor around, not much.

Terminator armor requires specialized training, and offers its increased protections at the cost of decreased mobility. It’s used mainly in situations where such a trade-off would be desired — clearing out space hulks is the most common example. The combat roles of Tactical, Assault, and Scout Marines, for instance, would remain largely unchanged and necessary. 

Dreadnoughts are meant to house severely disabled but still living Marines. Without a sudden increase in such candidates, they’ll mainly just gather dust.