Thorgast is not catchable, you need 1 reset for the first legendary.
But, where did you said it is about thorgast, cause you just made it look like alt-generic-behind when you said: "on alt it will be 10 times worse once you realise how much behind you are with no chances to catch up"
And yes, I got 5000k Soul Ash and I don't need it, don't use it. One you do your BiS Legendary, you are just doing thorgast for the fun,challange whatever of it.
Are you playing Shadowlands ? Link us your character that needed 5k of Soul Ashes.
And about resets of raiding, man, are you out of your mind, you want a catchup gear of a 5 week old patch ? Are you even thinking whem you write ? Don't you wanna catchup gear for last week's catchup gear ? Jesus Christ the kind of whining.
I'm sure they had better catchup gearing systems in TBC or WotLK. Remeber when you really had to do normal dungeons, heroic dungeons on every fk alt, and progress to lower raid tier to catchup on current raid tier ?
Now they really got gearing catchup systems implemented from the start of the expansion, with the covenant gear upgrade system. But, no ... they want mythic raid level catchup, when only 6 guilds in the world have full cleared Mythic NC
Hell, only 8% of raiding guildes cleared FULL HC.