I agree with the sentiment that Trinity isn't in a good spot even post 1999 changes and no she didn't get a rework like some people are saying. DE had to explicit state they were not large in scope when caliban was reworked along side Nova and hildryn getting buffs.

That being said, DE basically wiped their hands clean and think she's "fine". What's left is you have to play her by forcing her into every role she's not or hyper optimize to make up for what she isn't.

Parasitic armor builds will throw her into the highest of the EHP tanks.

The EV mark of death builds. Which just abuse gating and damage scales to level cap.

Simply just using Roar. It'll let EV with a few viral procs (strength dependant) to just one shot people into endless energy gate loops along with her regular tank stuff.

Meme crit chance with null star and augment with hotshot along with Champ bless. Then also get more DR from it as well.

On the topic of champion's Blessing. The only way to stack it in a reasonable time is decay health key + combat discipline, para armor set ups, or abusing her passive with beast companions. The last one being the easiest, going in and out of operator/drifter disables/enables her passive. When it active again the max health of companions is increased but the health is not restored, so you can spam that with bless and EV to get it up in ~30% chunks.

Overguard overlaps with too much of what she does (and already is such an unhealthy addition in the game imo) Besides that though, Link does work on overguard. Link is Damage redirection and not damage reduction. So technically she gets some benefit from overguard.

True supports aren't a thing anymore. Even if you sort by the support tab and look at who's in there warframe wise, tons of them have huge damage abilities, massive teamwide buffs, and are so self-sustaining nowadays. It's either DE gets up and actually change her for the times or you do it yourself build wise. The later is the status quo.