Short answer: hosting is part of your business infrastructure
Your website host affects speed, uptime, security, backups, support, and whether customers can reach you when they are ready to act. A good design cannot compensate for a site that loads slowly, goes down often, loses form submissions, or cannot be restored after a problem.
For WordPress sites, hosting and maintenance overlap. The server runs the site, but the WordPress layer still needs updates, backups, monitoring, caching, and someone responsible for the whole system.
Inconsistent uptime
When a server is unstable, users and search crawlers can hit errors. A few short outages may be easy to miss internally, but they can interrupt leads, checkout, booking, and reputation.
Slow response times
Cheap shared hosting can become crowded. If the server responds slowly before the page even starts loading, every design and SEO improvement has to work uphill.
Weak backup and recovery readiness
A backup is only useful if it exists, is recent enough, can be accessed, and can be restored. Hosting should be evaluated by recovery confidence, not just storage claims.
Security exposure
Current PHP versions, SSL, server patching, malware isolation, and file permissions all matter. Hosting quality is part of the same risk picture as WordPress maintenance.