I should just be quiet as this always turns into an unwanted pissing contest. As I said, you can shoot stuff that looks good enough for sure but the actual codec is just not a professional deliverable so aside from a layer for tracking, an insert, or possibly some B roll coverage, delivering a final that is not of master quality is by definition not a professional codec.
You can hide it by converting to a higher codec but as a master shot, you have to shoot in an uncompressed or at a minimum, lossless (not lossy..difference) codec. Prores and Avid DNxHD 175 (two professional deliverables if set right and can be duplicated forever. It's a master). It's compressed but when decompressed it in theory turns back to virtually uncompressed.
Acid uncompressed 10 bit video - Straight Raw video can be turned to any codec and is a master file more than or equal to any other. Completely lossless.
DJI AVIC AVC on board h.264 60mbsps bit rate and is h.264 and h.265 now at 100mbps bit rate.
Inspire 2 does both h.264 and h.265 and also shoots video with the SSD drive and the X5s at 5.2k and AvidDNG Cinema (a series of stills just like our single shots that are raw on the P4) and ProRes option.
If ALL of these videos looked EXATCLY the same, they would all not be equal because some are professional deliverables and some are not. You can, and people do, use a Phantom or a GoPro Black for a shot that is used professionally but you don't plan a pro shoot with a camera that is not capable of delivering a pro final deliverable.
On the X5S, you're gonna have to pay for the licensing to use ProRes. They could very well make the Phantom a pro system if they wanted but they have the Inspire and its heftier price tag for that.
I don't at all disagee that while it's easier to pull off certain shots by flying an Inspire or another bird, you can get pro results with the Phantoms, just not pro codec, hence it's an enthusiast/prosumer UAS.