As far as LCD flat panels go, the older ones from circa 2009-10 were a lot better made, with matte displays, no easily obsolete 'smart' apps, which you could just as easily use a Roku for and have better support, and with CCFL backlighting that not only has better colours and blacks, but lasts longer than the infamous Samsung LED strips that short or die causing a myriad problems. Used flat panel TVs from that era are super cheap secondhand, ranging from $20-60 for a 37" set, but I've seen some around 45" going for $10 at Goodwill.
I don't know why Plasmas are extinct. Never seen one used anywhere, and nobody owns one. The only one I remember was a 55" Pioneer my stepdad had that weighed a ton, but had a picture that would rival OLED. He purchased it new around 2007 or 2008, and it's still running fine at a family member of his that he gave it to. Wish I took the offer for it when he asked me, but at the time I lived in a trailer that you'd never get a 55" through the door much less fit anywhere.
I got turned off of Samsung TVs after hearing how they place capacitors of dubious brands near very hot heatsinks, almost like they expect them to dry out.
That said, I am using CRTs this day and age. Probably will outlive me, and since most content I watch is SD or black and white, I ain't missing much. Interested in how Babylon 5 looks on a CRT, being period correct time frame. It looked unwatchable (especially the CGI) on anything LCD.