Between the "most guys I know just coast" or they were "winning because they were stronger" it's starting to sound like your the one that doest know "jack-shit" about MT.
Nobody I train with "coasts", because they don't last. The longer you train the more that's expected, if your "coasting" you can sit in the pad banging class with the beginners, because guys aren't going to take it easy on you because you can't be bothered to work.
If a guy is 6-1 in MT that means his opponent probably had a similar record, be it 4-2, 3-3, even 2-5. Guys are matched by records, the chances of somebody fighting a debut fighter by the time you get to 6-1 are pretty fucking slim. That's how people that REALLY train MT look at each other on paper.
If you your too scared or lazy to fight and build a record that's up to you, but MT is a sport, so you don't do MT unless you fight or are building up to fight.
The same way me hitting a golf ball at a driving range doesn't mean I play Golf.