I have to agree.
I'm only just learning (the hard way) that all of the iniBuilds Airbus' use the default navdata having tried to perform a flight between VHHH and ZSPD, whereby the data for the STAR (BK91A > ILS Z 35R) shows waypoints along it 6000nm miles away, bringing the EFOB to its knees and dragging the frame rate with it. Load the same route into the Fenix A320 and it is faultless; with Fenix using Navigraph's navdata.
Whilst I haven't faced the same issue at other airports yet (barring VHHH initially but managed to fix this), it troubles me to think that, at any one time, I'm not using the reliable Navigraph navdata that I have installed and am instead relying on the "somewhat" reliable default navdata.
It's a big shame for me as the A330 was the aircraft I was looking forward to the most out of all the aircraft that came with the sim upon launch. With the A350 round the corner and very hotly anticipated by the community, myself included, I can't help but worry about the cost of the product vs its functionality when it comes to navdata.
