I have never owned a Festool anything. The ones I have used seem WAY over priced for what you get. They seem more like prestige tools than actually superior tools.
For a home shop the Makita seems like a sweet spot for capability vs price. I have a 60" sliding table saw and a 24" cross cut radial arm saw so I seem to only use my track saw for the initial break down of whole sheets. After I can move the pieces around easily I don't have any more use for a track saw.
I would certainly find out how much it will cost to repair your T75. If you do decide to get rid of it out of disgust you will be able to sell a working T75 for a lot more than a non-working one! It sounds like there are some on this thread that are anxious to buy your non-working T75, send it off to be repaired and turn a quick buck from your misfortune.
P.S. I talked myself into buying a Mafell track saw. While it is a fantastic track saw it doesn't do anything (or do anything better) than my neighbors Makita which was less than half the price. My Mafell track saw has a brushless motor. Does the T75 have a brushless motor?