What am I missing about Sith Eternal's mods?

from gaming-fans.com:

he has the highest Health Steal in the game at 65% (tied with Padme Amidala), making Health an even more important stat.
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Aside from just general survivability, I don't see much else regarding health and/or protection preferences there.

It allows him to survive against Rey's Whirlwinds and Ultimate. Usually good for 1-2 relic levels higher than yours if you're all health.

He also loses his first special once he transforms into his Ultimate.

SEE usually wins by living long enough to nuke the opposing team to oblivion. You need a massive health pool, often boosted by a support unit like Armorer, to achieve that (and Beskar boosts your defense/health stats, not protection). He also has a mechanism to increase/recover his protection pool, so you don’t need to focus on that as much as health. Focusing on protection will definitely make you lose against JMK teams since they can hit under protection after ult. But if you have a large enough health pool, you can still survive long enough to win.

Also, if you want to get a better understanding on the WHY on how to mod different units teams, I can't recommend Xaereth Prevails channel on Youtube enough. Specifically look to the "Faction Essentials", "Crash Course", "Toons You're Modding Poorly", and "You've finally unlocked...now what?" series.

See with wat, mod him for 200k ish health and stick tank tech on him. He works through most reys. Datacrons make it sketchy sometimes but..