Thai teachers are not Classical Theravāda

Burma is the only one in the world that still have buddhist ancient learning system (mukkhapāṭha). The strongest buddhism country is Burma. The tipitaka-strictest nikāya is Shwegyin Nikaya of Burma.

What about your thai teacher?

Thailand and srilanka have lost tipitaka learning system in colonization war.

Thailand began to lost our tipitaka learning system about 1855 and after that years (Bowring Treaty).

The king trying to protect thailand by changing every rules of us. They also changed learning system of monk, too. They cancle memorized learning system, then took a writing learning system instead. We also started to lose abhidhamma learning system at this time, too.

Writing learning system is for kamaguna 5. They save memorizing times to consume kamaguna 5.

Arahanta havn't writen. They keep tipitaka in their mind.

Before that time we still having tipitakathara, such as mun bhuritutto (not too much memorized). But after the changing, we never have tipitakathara anymore. The elder tipitakathara died. Never have any newer to be instead of them.

So, thailand loose our tipitaka learning system so long time ago in colonization war.