That's unusual, those Japanese built Mahindra tractors were/are super reliable. But a bad glow plug, a dirty connection or a poorly adjusted safety switch can make anything not start. In the hands of a competent technician, whatever was causing your 2015 to not be a reliable starter could have been easily and quickly fixed.
I'm not saying they were perfect. They used little cheesy battery cable ends for a few years, and combined with a low dollar Exide battery the terminal ends would corrode and make a poor connection. And early 2015s consumed glow plugs at a much faster rate than would be expected (later updated and problem fixed). Routine maintenance would catch these items before they became a reliability issue. I really like the Mitsu Mahindra product so I may be a bit biased.