I think Voice is great but it seems a bit abandoned from Google

The feature set has not changed much since launch but it's definitely not abandoned.

The feature set has been reduced from the days when voice was still it's own company called grand central.

I had more than one phone number but some time after Google came in they said pick one and the rest have to go.

You can actually have more than one number still. I do at least. This happens if you add a number by porting your USA cell phone number to google voice. This gives you the option to keep both, although it’s $20 and you have actively elect to make your original google voice number permanent.