@Sophie ************
What you read in this group can only be based on personal experiences.
A thai immigration can check if you still fullfill the visa requirements - thats covered by law. They rarely do it, but they can and they sometimes do. Expect the unexpected and be prepared.
Example (of another visa type): People have been denied entry for not carrying the required amount of cash. It wasn’t really enforced before, but authorities can decide to check at any time. These are discretionary spot checks — you never know when they’ll look closer. It may work 99 times, but that one time can cost you entry.
Means never be too sure and be prepared.