Something Ive noticed when trying to use AI Flightplans and AI Aircraft

I have a massive collection of FAIB, TFS etc etc etc Aircraft. Alot of them I have found used in various AI Traffic programs I own. Probably would be alot bigger if I hadnt lost my old FSX Drive due to failure as I had stuff on there going way back. Some of it I will never see again the rest I have and can redownload from Avsim Flightsim.com etc. The textures on the planes in UTLive are easliy replaced or adjusted in photoshop anyway. Its just very time consuming but worth it all in the end.
Dont know why they changed the way MSFS reads flightplans though they should have left it like FSX. That way the WOAI and AIG Flightplans would all be fine and there wouldnt be upto 7 aircraft all departing at the same time from the same airline for the same destination lol.
They should have also left it so that MSFS can load more than one livery per model at the same time like FSX did. I dont even see the logic in why they did that when they knew we all use Custom AI Flightplans and Liveries such as WOAI AIG etc etc.
Guess its the same old thing as most game companies, let the modders fix it lol.