What Industries Need Call Tracking More Than a Traditional PBX?

I have noticed many businesses still invest heavily in PBX systems, while others are moving toward call tracking and conversation analytics platforms.

For example:

• A call center may prioritize PBX features like routing and queue management.
• A marketing-driven business may care more about knowing which ads, keywords, or campaigns generate phone calls.

If you had to choose one, which industries benefit most from call tracking software, and which still need a robust PBX system?

Would love to hear examples from agencies, healthcare providers, legal firms, contractors, and other phone-dependent businesses.