Recent changes to lore skill lowered DC for identifying items even more. I had a lot of fun when supporting other pcs with such skill, it was another great reason to have interractions, I liked the change of increasing disarming traps and unlocking chests DC so many rouge role pcs were rewarded for investing in such skills. At higher levels everyone got rings and spells which is sufficient to identify almost every item in the game. I believe 15 to 20 skill points is a hard cap. I would love to see it more "profesionalized" at least for high level items. More like 25 to 30 skill points for high level items.
Haven't noticed any lowering of DCs myself, but I think Lore is in good place currently as a skill.
As an aside, the absolute requirement to have a rogue for many dungeons that you praise is why some dungeons are constantly depleted, leading to the calls for increasing the spawn rate and adding new dungeons.
High-skill PCs tend to be the wealthiest PCs on the server already. Aside from their ability to ninja loot, most balanced parties will want to have someone who can identify items, and, typically, sell them as well, leading to more money for everyone involved. Not only do those parties save the cost of paying for identification and receive better prices, but bringing heavy items and other vendor trash becomes worthwhile.
My extremely high level main is medium invested in Lore as a class skill. She has three items to boost it. Nevertheless, some things she can't identify and most she can't without using the items, one of which weighs 3 pounds. Carrying capacity is a constraint for every character, so to have that item with her she must forego something else. The ring switching means she loses two spell lots that she then has to re-add. She also has all the appraise gear, but must also equip and unequip that.
My medium level alt does not have Lore as a class skill. She can identify nothing without equipping the gear, and most everything is still not identifiable. When she pays the Vistani to identify something (and all the time and hassle that entails), she will barely make back the money it costs. I think she has even lost money in some cases.
So how does this play out?
Generally, I don't bother. It's just not worth it to me to grab vendor trash, carry it, try to identify it, switch to appraise gear, and sell it. My PCs grab the gold and the lightweight. The only places I would find something worthwhile to either PC, I'm not going to be soloing anyway. As a consequence, my PCs don't tend to accumulate the massive sums others of their level have, but I find this game requires inordinate amounts of time as is to achieve anything meaningful, so any tedium and repetition I can avoid is all to the good.
That I would try to find a high-lore PC I didn't know or have other reasons to interact with so as to identify the items for me...that's not going to happen, your previous experience to the contrary.
TLDR: I suppose Devs could increase the Lore required to identify the most valuable items, those that go for say 30K and more on the PC market. But an across-the-board DC increase for vendor trash just makes it trashier.