what tv do you have right now?
it's funny. i went through the same agonizing process of whether or not to buy the tv AFTER i bought it because the damn thing was selling out so fast at amazon. i considered everthing and i mean everything. Went to bestbuy to see if OLED is better. OLED IS better. by a longshot. even the sony oled. but then i asked myself this very simple question, do I want a bigger tv or a better looking tv for almost $2,000 more. the answer was simple.
I say if you are ok with the 55 inch size, go with the LG oled. it has 4 hdmi 2.1 ports which is going to come in handy if you have a sound bar and multiple consoles or PC. i have to give up on eARC because the x900h only has two hdmi 2.1 ports and one of them is eARC.
I also considered waiting until next year, but lets face it, you wont get the black friday prices for these tvs. i got mine for $900 off with the black friday guarantee. that same tv wouldve cost me $2,500 at launch back in july. so lets say if they come out with a better tv next july, you wont be able to afford it until black friday anyway. can you wait a full year? i know i didnt want to.
as for burn in, i saw some youtubers who said burn in isnt an issue, and some who said it might be if you like to game five hours a day. but its mostly related to hud, so if you turn off the HUD when doing long sessions, you will be fine. or just buy it from costco which should come with a 5 year warranty though im not a 100% sure if it covers burn in.