It's kinda sad that you can't talk with Triss about that scene afterwards. CDPR really had a great opportunity here to give her some more meaningful dialogue, but I think we can all agree that this applies to Kaer Morhen as a whole
Yes, that would have been a great exchange for all of them. Right after you turn Yen down she could ask if it is because of Triss. You could tell Triss later that the bond between you and Yen is broken. She's happy about it because she knows you finally chose her but she feels a little bad for Yen. Would have been a great opportunity to develop the relationships a little bit more.
Realy great thread guys. Was searching for people that think similar about all this ''Triss situation''. Just finished my first playthrough and I feel like sh*t. Realy disappointed and all. This is almost like a group therapy
Welcome to Team Triss Yawoon.

Feel free to join the discussion and voice any concerns you've had. Like I said, I could talk Triss all day but as there's nigh 600 posts on here, a lot of it has been said before. It helps to know just how many people share your concerns and slightly differing viewpoints. Also, make sure you vote at the top.
Not that i'm likely to ever do it but if Triss leaves for Kovir, does the Philippa quest happen later with Dijsktra just without Triss' prompting? The guide i've got doesn't seem to acknowledge that variant.
Nope. After you cure Uma and bring Ciri back to Kaer Morhen, Triss will be there regardless. If you told her to go there then you can sort of tell yourself that she's there because of you. If you let her leave to Kovir then she comes back at Yennefer's behest. Check the character entry for Triss in the glossary to confirm. That's another issue we seem to have. It doesn't matter what your choice is regarding her staying/going she disappears for 40 hours and then shows up later. That's why we say that it seems that this particular choice has no real consequences (except for your potential relationship but that's an entirely different can of worms).
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With Uma Yen would be enraged if Triss was consulted first
But she's okay asking that Elven mage through the megascope? She's okay with accepting Triss's help during the siege? She's okay having Triss help them locate the other lodge members? I can't imagine why she would be enraged as you put it. Maybe uncomfortable but wouldn't that discomfort be vindicated if they bring Ciri back? If they were "dear friends" once then surely they could work together to help break this difficult curse.
I can see how they can justify Yen kiss. What i don't see is why Geralt doesn't push her away or Triss have comment/full reaction to it in solely romanced variant.
Yeah I can see why she did it - but why was that it? Why didn't anybody anywhere say anything?
Ciri: "Oh! So you guys are back together?"
or
Triss: "Hey, lips to yourself, missy"
or
Geralt: "Sorry Yen, I only kiss Triss now." or "Sorry about that kiss earlier, Triss, she just sort of surprised me. One time thing"
Personally though, I'd prefer it if she just hugged him - get that kiss out of there and only include it if you romanced Yennefer.