I bought an 1190 in May June 2016, sold it in October 2019 - I got it with £3k off list and it stood me in @£11500 with extras (Heated Frips / Comfort Seats) and I sold it for £7300 - Losing £4200 in 40 months...
...A mate lost almost £7k in under 2 years on a 1200GS Rallye, I would of still lost less even if I paid full list for the 1190.
Got a deal on my current 1290 (about £3k off - £12,500 OTR with grips / crash bars) and it is now 3 years old and worth about £9k all day long, again had I paid full whack I would still be looking at a smaller loss over 3 years than my buddy had with his BMW in 2 years.
People have this perception of BMW's having great resale, well they do at dealer prices as a franchised used bike with 2 years warranty, try flogging one back to the dealer for cash or privately and reality will kick in PDQ....
...Still, worth getting a good deal on a KTM (or any bike for that matter, I have bough heavily discounted new Yamaha and Kawasaki in the past) to minimize you losses, or even a low mileage used bike if your not so sure your going to like it, but having said that not too many people go back to a BMW after a KTM.
Worth testing the latest Adventure as well, it has evolved a little for 2021 and is now suitable for folk under 6 foot ;-) The GT is a bit sporty for some, after years of adventure bikes I did not get on with it despite really fancying having one, and a mate recently had one for a bit and declared he preferred his 1190 adventure and flogged it after a few months.