Mostly efficient tables and heuristics, but the tier definitions are restated three times (three-tier model table, tier-membership heuristic list, worked example) and data sources like StatCounter/MDN are briefly explained, so it could be tightened.

Concrete and specific throughout: exact traffic thresholds (>=5%, 1-5%, <1%, <0.1%), named data sources, an infra cost-tier mapping table, and a copy-paste matrix template — fully actionable for an instruction-only reference skill.

The 8-step 'How to use' sequence is clearly ordered and step 8 is an explicit validation checkpoint requiring two independent traffic sources plus a statutory/SLA check before dropping a combo, with a re-review fallback.

The strategy content lives inline as the skill's value, while the fillable artifact is cleanly externalized to a single one-level-deep, clearly-linked reference (references/matrix-template.md, referenced twice).

Lists multiple concrete capabilities with explicit parameters: 'T1 >=5% traffic, T2 1-5% or statutory, T3 <1%', named traffic sources, a worked matrix template, and legacy-browser drop justification.

Explicitly answers both what (pure-reference for designing/reviewing a browser test matrix from traffic data) and when (the 'Use when...' clause with three concrete triggers).

The 'Use when designing an initial matrix, running a quarterly re-tier review, or making the case to drop a browser' clause covers natural phrasings a QA engineer would actually say.

Claims a clear niche as the 'WHAT-to-test strategy reference' and explicitly delegates execution to browser-matrix-runner / selenium-grid-4-runner and budget-setting to compatibility-budget, avoiding overlap.