Ventress is not a "glass cannon" she serves more then one purpose and generally dosent require the protection as she isn't seen as much of a threat. This is bc the ai can't use her, she is good but only when used with tactics. Ig88 has one use and one only DO DAMAGE as much as quick as possible, people will usually target ig88 first bc he will do a lot of damage+ability block so you use Poe to taunt so people cannot attack Ig88 therefore he survives to continue to deal damage. Think of Poe as a sacrificial charcter, his only use is to protect low health characters that deal a lot of damage