Discuss the value of Web standards from four aspects with a mind map

I have roughly listed some values ​​to stimulate discussion, hoping to improve this idea and get better opinions. How to obtain the specific inventory data is still under exploration.

People-oriented - Visitors:

Speed ​​up access (how, how much, fewer bytes, lower concurrency)

Multiple devices to choose from (multiple browsers, multiple browser versions, multiple devices)

Multiple styles available (skin-changing technology)

No Inclusion for People with Disabilities (WAI)

For people - developers:

Speed ​​of development (single version development, no need to develop independently for other devices)

Maintenance complexity (after separation, the structure can be reused, the style can be reused, and the images and CSS can be maintained independently)

For people - operators:

Server costs

The cost of bandwidth

Development cost (multi-version development)

Cost of SEO (better search engine targeting)

Machine-oriented - Server load:

Bandwidth savings

Search engine friendly

Web data mining (semantic web, microformats, XSL data extraction, etc.)

Web standards value mind map: