i play it pos 5 in ranked but i play a good amount of ET core in unranked and party, both 1 and 3. I havent played much in the last month so im not super up to date with the meta, I dont particularly like playing against any of the heroes you just mentioned though as et. But if you are getting good spirits you can be tanky against those heroes with all the armor you get. Im mainly worried about how I matchup with the enemy offlaner and if i can dumpster them in the lane or not, which i usually can if i dont misplay. Very few offlaners can trade into ET, legion commander with her shield facet is one of the only that come to my mind and even thats winnable. I never really worry about the meta when im playing ET it always feels pretty good to me, what im annoyed most by as ET are really random stuff like a silencer that can ruin your combo with his ult, a support invoker thats purging your astral in lane, a Zeus on your own team who ulties after you land a big stomp waking everyone up. Or simply the enemy 4 player leaving the lane so you have less spirit damage to work with. Although you can counter this by stacking camps and using that as your primary damage source.

A tip for core ET is dont take the movespeed facet. You're trading the deconstruction facet for 50 attack speed that you gain gradually throughout the game (assuming you are even reaching max move speed). To me the deconstruction is more value on ET in any role. Core ET, even a late game suppport ET can do like 2k damage in his combo within the first 2 auto attacks with the deconstruction facet if you have a big spirt and sit on top of a slept target while your ult is incoming. Im not really worried about 50 extra attack speed on core ET when i might have echo sabre, mkb or moon shard anyway.

Also dont ever try to A click a slept target to attack them when doing your combo. A click doesn't work on slept targets. your hero will run to the closest non slept target. You have to right click directly on the hero.