Why didn't you just link your char instead of telling dps/hps numbers. All I have to go on is achievements on your char but you haven't landed a CE since Garrosh. You have barely raided mythic content at all since then but you think since you raided high end almost 7 years ago you can comment about the difficulty of current high end prog content?
As to the whole "it took weeks to kill things like 0 light yogg and LK"
1) Obviously LK had 50 wipes per week across the raid and took ~7weeks to die. Thats 350 pulls to clear the whole raid. Guilds in SoD were on like painsmith or soulrender prog by time to they hit 350 instance wipes for the week 1 race, and they were loaded up on split run gear and BoE's which easily compete with the extra weeks of heroic farm. Maybe slightly behind.
2) Next blizzards ability to balance content pre-release has gotten WAYYYYY better in the past 10 years. World first raiders back in Ulduar days were the beta testers as oppose to today where they have internal raid test teams to make sure things are functioning properly even on the hardest content.
3) Guilds internal reporting functions and in pull tools have gotten substantially better. Wlogs and WA's and the ability for guilds to parse through pulls with these tools allow for extremely difficult mechanics to get figured out and handled quickly.
Comparing prog times then vs now is so apples to oranges. Its a different game. LK was a HARD fight for THEN but when wotlk classic comes you will see guilds full of players that never played the game in Wotlk still kill the boss in minimal pulls. I would go as far to bet the raid is cleared week 1 of heroic within the first 50 wipes.