personally i dislike 4.0 relic for the fact i don't feel like i earned it, i mean, 2.0 and 3.0 relics forced you to do content, 4.0 relic you can basically afk for most of it(just bothering whit killing NM) and end up whit a relic, i do not find fun killing mobs what hardly keeps you busy(and for this i love dungeons or other instance content what is not potd/hoh/diadem/eureka)

also, i don't get why people has to get their relic on like day 1, 2.0 and 3.0 relic steps literally has that insane amount of tomes required to make it last for around 1 month if you played it on the intended casual way when they where relevant
now, i won't say what all the steps of the 2.0/3.0 relics where good, there are some bad obviously, arr relic was rather annoying on some parts(especially on atma step when relevant and book step while relevant AND currently), but hw relic?, its probably the easiest relic to get into since it gives you on most of its steps many ways to upgrade it(yes im excluding atma step if you didnt had a zeta relic and lvl 50 to 60 dungeons, since those had only one way to progress thro), you could do it by dungeons, you could do it by raids, you could do it by pvp!, even diadem 2.0 helped, you literally pogressed it whit whatever you did
i hope what if they do make the next relic, they make a "weekly" cap or something for turn in stuff like that to make everyone just not burn themselves on hardcore farming it, because that is one thing a lot of people suffered from on both arr and hw relics, they whanted their relic as soon as posible what they grinded it hard to the point to burn themselves