I'm no linguist, but Malayalam has a more predictable stacking rule than Devanagari, more so in the modern alphabet/sandhi scheme than the old. For instance, on

I'm no linguist, but Malayalam has a more predictable stacking rule than Devanagari, more so in the modern alphabet/sandhi scheme than the old. For instance, one can barely tell apart ह्म and ह्य, but their Malayalam equivalents are pretty distinct: ഹ്മ (old scheme) and ഹ്‌മ (modern scheme) for the first, and ഹ്യ for the second.