The problem some people have in these areas is they can't get the proper things to care for them. It's hard to find a UTH in some countries. If a baby snake is raised without one from birth, they can live a perfectly normal life. However, if they had one before, they'll need one again.
BG knows a lot of people in other countries(near the equator) that use no heat source at all and have no issues. There temps are close to 90 all the time though. BG does not suggest this. He does know a big time boa breeder that keeps his baby boas at 90 all the time with super high humidity(BG heard this) and has no issues. "No issues" until he sells them that is.