All the information I can find on the Esp 8266 seems really out of date
My vinyl turntable is also "out of date" if I google for instructions which are more than 40 years old.
But is it obsolete, only being 40+ years old? No - absolutely not.
Don't expect that something brandnew will give you an advantage out of the box.
A lot of people here and elsewhere in the I-Net have reported back success stories with their 8266.
So it's definitely not a question of age being obsolete or not.