I think 8th is an improvement although others disagree, but the key point is that pretty much everybody (bar
GSC and Sisters) has had a codex update for 8th, and most of them are better balanced than before
It's still not going to please those who want absolute balance but I think it's in a better place than before
if you like the deathguard you may want to check out the partworks magazine Warhammer 40,000: Conquest from Hatchette that's just starting out as it's going to deliver a deathguard and primeris marine army over 80 issues
(issue 6 was out on Wed ,
wh smiths & forbidden planet still seem to be stocking it so even if you don't want to subscribe you can pick up individual issues)
https://www.dakkadakka.com/dakkaforum/posts/list/840/751837.page#10178774