Released a broken Eureka

[Solarra]

...what I've seen of these forums the last little while the majority of people try it for a little bit get either bored, stressed out or maybe are just new to what a huge step up of a grind the relic-based content seems to have in contrast with the rest of the game

I agree people should give things a chance before they condemn them. However, if the content is turning people off in the early stages, I think their criticisms are valid, even if they don't continue to play through it.
I think only new players might have been unprepared for how much of a grind the relic tends to be, and the criticisms aren't just coming from them.

The problem is that it's hard at low levels, not at high ones. The only difficulty is enduring to level 20, which isn't good design. So people are getting really bored at how limited the exp curve is; you just sit around in party waiting for a few people to take care of things, and the amount of things you can contribute meaningfully too is very little till you hit 15. The difficulty makes people get carried at low levels instead of having fun

Agree, 100% The motivation is backwards.
Nearly all successful games have a system where levels/rewards are fairly easy to get initially, and the difficulty gradually ramps up. That works.
Loading the difficulty on the lower levels doesn't motivate people to continue.
Making levelling incredibly slow unless you tag along with higher levelled players and get carried might be efficient, but it isn't fun or engaging.
A lot of people are saying Eureka gets better at higher levels. That might be true but it doesn't make the lower levels any more fun.
I think your list if implemented would definitely help low-level players and late starters.

Deal with it...

We are paying for this content. If people don't find it fun or engaging then telling them to suck it up isn't going to change their opinion.
If you enjoyed Eureka, that's great.
If you didn't enjoy it but you pushed through it anyway to get the rewards, that's a perfectly valid choice.
However, none of that invalidates the criticisms of people who aren't enjoying it and would like to see improvements.