I take a different view on whether the merger is good or bad for customers.
I think it's good. Added spectrum on the AT&T Network helps coverage and data speeds. They are still investing heavily in backhaul.
Having 4 (2 with decent coverage, 2 without) isn't really good for customers.
Customer choice isn't always about price. People want it all without paying for it.
I've used Sprint and t-Mobile and speed and coverage were horrible. I'd rather the added coverage and speed when I need it rather than a cheap alternative.
Price gouging and price-fixing can be regulated. It's like illegal immigration, there are plenty of laws covering it, they just need to enforce them.