It is not true anymore that 2 one-way tickets are a lot more than RT. I do this all the time at the 330 day windows for both legs of trips.
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On American, two one-ways will equal the cost of a roundtrip. However, if you make two one-ways and need to change each one then you will be charged two change fees. If you need to change both the outbound and inbound flights on a roundtrip you will only incur one change fee.
Not true by my research. Using Charlotte to Maui, departing Feb 2, 2019 and returning Feb 9, 2019 as a pro-forma example:
Best fare 2/2/19 - American Airlines one-way CLT to OGG - $517
Best fare 2/9/19 - American Airlines one-way OGG to CLT - $568
TOTAL $1085 (main cabin) - this was also the lowest fare on any itinerary with just one stop/connection
Roundtrip CLT-OGG-CLT, same flights, same dates,
TOTAL $943 (main cabin) also the lowest fare of any flights on this itinerary
Another more extreme example is the flights we have scheduled for our Mediterranean cruise from Barcelona to Rome this coming September. We are flying nonstop Charlotte to Barcelona, and then nonstop Rome back to Charlotte a couple weeks later. Here are the prices if we were to book that trip today (we booked our flights a few months ago as a RT, so our fare is even less than the RT fare shown below):
Best fare American Airlines 9/1/18 one-way CLT to BCN nonstop - $2764
Best fare American Airlines 9/15/18 one-way FCO to CLT nonstop - $3003
TOTAL $5767 (main cabin)
Best fare booked as roundtrip CLT to BCN, FCO to CLT same dates, same flights,
TOTAL $1499 (main cabin)