Slayer should not be this slow in leagues, and the relic should affect xp rates more

With relics in leagues we can get a lot of 99s quickly, and it is a temporary mode. Meanwhile slayer takes considerably more time, and a lot of important content is locked behind it depending on region. This includes a massive amount of demonic pacts and some echo bosses. Echo Thermy is 93, Araxxor 92 (pact point). Abyssal whip is one of the only good melee weapons below 1kg and has its icon on the skill tree, also locked behind 85 slayer. Most regions have a bunch of pact points locked behind ~90 slayer

All combat levels got to 99 and even 25 mil before reaching those slayer goals. I have an account with culling spree and one without. The one with culling spree gets marginally better xp rates from picking tasks, but fundamentally isn't much faster. The superiors perk almost never happens on any given 200 kills task. You'll be lucky if it happens 3 times in 200 kills. It's not even remotely comparable to how any of the other skills go.

By the time you're grinding 90+ slayer, the majority of the monsters have little to no loot you could possibly care about as your relics are likely solving a lot of your supplies need.

Leagues are meant to be sped up and OP, and having a lot of the content be effectively closed off by timegating is just artificially delaying the whole mode for content we should be able to access. Especially echo bosses