Fu Xuan havers, do you still recommend her?
IMO yes, especially if your DPS needs/wants the extra crit boost she brings, but with Huohuo and Aventurine, she's certainly not AS critical as she once was.
She DOES have trouble in the hardest content (Basically just swarm/G&G tier 5 and conundrums, to be fair) since she can't 'actively' mitigate with shields (which is what most of the current preservation 'gimmick' relies around), and her rest-of-team heal isn't super strong unless you either sacrifice some of her HP/DEF tankiness in order to get an outgoing healing chest or heal relic 2-piece (or get a lot of abundance heal boosts and HP boosts during Swarm/G&G runs)
If we get 'another' Huohuo or Aventurine-level of future-unit powercreep in the next tank unit, she's potentially at risk of losing 'some' of her luster......but she'll likely still be great for mono-quantum and/or hypercarry teams over the other sustains, though (until they give another tank/healer team-wide crit, or start making team-wide crit-rate relic bonuses)