Please no more Eureka!

[Reynhart]

If you are coming late to Pyros then you will have a problem.

Not for the weapon. At worst, you might have a problem getting the armor, and only for Logograms dropped by heated box.
And that without even using Logos actions to kill mobs, mainly the Reflect to wreckhigh level sprites.

I've had one person describe Eureka as FF XI effort for nowhere near the XI reward.

Nowhere near FFXI effort too.

For the record, the very first incarnation of a Relic weapon require more than 10000 Ancient Currencies. At best, a good Dynamis run would initially drop around 200 currencies. But, those currencies were sellable on the market board, entry required an Item that cost 1M Gils and between 40 and 64 people. So basically, once you dropped the Currencies, you frequently had to buy them back from your own Linkshell. Aside from that, you could only enter in Dynamis once every 72 hours and the Key Item was destroyed upon entering, meaning that you had to buy a new item even if you completely fail your Dynamis run.

Fast forward several years, the entry Item is now a permanent Key Item that cost 50k (Unless you do a quest that grants permanent access), monsters are still level 75 compared to level 99 characters, and there is a proc system so that doing a specific action/Spell/Weapon Skill ensures single-unit currency drop rate, with a rare white proc that ensure 100-unit currency drop. After seeing that, there's no reason Eureka can't be made soloable in ShadowBringers.