Does Teemo really remain strong late game when his value mainly comes from terrain taxation?

The most reliable build on Teemo is the one that preserves the first spike while still keeping an escape valve. If your item order prevents you from playing the champion's first real window, the build may look strong on paper but it is not reliable.

When should you truly adapt Teemo's build instead of pushing standard attrition?

You should adapt as soon as the enemy draft stops you from playing the timing the build was meant to serve. If you need to survive longer, absorb more poke, or answer a specific engage pattern, the purchase order must move before you even think about the final six-slot build.

Which enchant should Teemo choose when the priority is mainly staying a mobile nuisance?

stasis is often the most stable choice because it directly supports this game plan: create constant pressure and dangerous zones.

Teemo Wild Rift Best Build Guide (Patch 7.2a)

Teemo Wild Rift Best Build Guide

Attrition-and-map build: Teemo does not win because he has a clean all-in, but because he imposes a permanent tax on enemy movement. The premium build reinforces that identity of intelligent harassment, traps that close the map, and repeated small trades that make every objective harder to contest.