I will jump into the Season this week-end when I have a bit more time to play. Season is where I will spend most of my time as usual. I was just reporting some facts on how the seasonal updates work and their consequences on Eternal players. I am not one of them but still value my old builds and use them from time to time. Checked how my S4 build was performing in S5 and, as usual, it was worse even though it was already a weak build.
Seasons are made to sell BP and cosmetics. You can enjoy the game the same way playing Eternal, not so much difference in terms of content. For those who can’t afford spending a lot of time playing (I can), Eternal is a good option. Seasonal updates could be made without destroying the efforts they made so far.