What is Gragas's most reliable build when he mainly has to break fight structure from one angle?

The most reliable build on Gragas 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 Gragas's build instead of simply pushing standard burst?

Needs adaptation against high burst or tank-heavy comps where one-shot isn't realistic.

Which enchant should Gragas choose when the real problem is mainly surviving the answer after combo?

protobelt is often the most stable choice because it directly supports this game plan: create fast picks while staying tanky enough to survive after engaging.

Gragas Wild Rift Best Build Guide (Patch 7.2a)

Gragas generates value by controlling enemy positioning and removing key targets. The build maximizes burst while adding survivability to avoid immediate punishment.