Battlesuits are the pride of the T'au Empire. And they're filled with all sorts of points of optimization and customization. Check out some of the upcoming upgrades that will be in their Codex when it's released next year.
From the article:
Battlesuits are the emblems of the T’au Empire. Each one is designed for a specific purpose, whether it’s sneaking behind enemy lines or assaulting vital links in their command chain, and they’re all potent force multipliers on the battlefield. Codex: T’au Empire is due to launch in early 2022, and it comes with some tasty upgrades for all your battlesuits.