Emails vs. Web Pages - SEO/meta tags are primarily designed for web pages. They help search engines index and rank pages. Email clients and email servers have different functionalities and may not interpret or prioritize SEO/meta tags the way web browsers do.

Limited Impact - Emails are typically not indexed by search engines like web pages. As a result, the impact of SEO/meta tags in email templates on search engine rankings is limited.

Focus on Delivery and Open Rates - Email templates are primarily designed for communication with subscribers. Unlike web pages or blog posts, email templates are not really part of the SEO ecosystem. Improving delivery and open rates are often the main concerns for email marketers.

Technical Constraints - Some email clients may not fully support or interpret HTML meta tags within emails. This could lead to inconsistent results across different email clients and a challenging user experience.

Privacy and Tracking Concerns - Email tracking and open tracking mechanisms are often used in email marketing. These mechanisms can conflict with SEO/meta tags. Some folks might also be concerned about the privacy implications of combining these technologies.

Legal and Compliance Considerations - There may be legal or compliance considerations related to the use of meta tags in emails, such as ensuring that email content complies with regulations like CAN-SPAM or GDPR.