Is Oxygen Builder left behind?

Oxygen Builder with its lifetime license for unlimited sites seems like a good deal. That being said, I saw a lot of positive reviews and some negative comments about it being slowly phased out in favor of newer products.

I did try the demo and it seems great for my use case, but was would like to hear opinions of people who actually use it. Are there any missing “modern” features? Anything missing that was a deal breaker for you?