I would definitely disagree with this assessment.
The only Pro feature I can think of can affect reliability is a different caching provider (with which we had more problems than the standard caching provider). I consider this a proposed web farm script provider, but in most typical scenarios this will not be a big problem.
A community is the same community edition that has been used on real sites for many years, and there has been no harm to it since the release of the Pro version. The Pro version is just a few custom extensions on top of the community version, most of which are quite optional for the daily use of the website.
Advanced Content Workflows
Content negotiation ensures that any of your users affected by a change in content can approve updates before they start living. Workflow permissions can be configured in the top-level hierarchy at the site, page, and module level. The mechanism of business rules allows you to work with an unlimited number of states and reviewers.
Granular permissions
Advanced permissions at the page, module, and folder level provide advanced security rights that let you determine exactly which content participants can edit these modules on each page.
Advanced site search
The search engine includes rich query syntax with support for Boolean searches, phrase searches, relevance searches, wildcards, fuzzy searches, and groupings. Includes a real web spider, capable of indexing any site, which eliminates the need to implement the ISearchable interface within the modules.
Configuration manager
The host user can manage various configuration files that control operation at runtime. Download a configuration merge script that you can use to automate many more repetitive and complex configuration operations.
Content
Content providers and software developers make all the changes to their website on a physically separate staging server. You push the milestone site to production when all changes have been checked, tested and approved.
My editable pages
Links to all pages and site modules to which the user has permission to edit are displayed, which allows you to effectively edit pages
Document management
A complete document management solution that allows your organization to store, control and view documents online
Module caching
A database caching provider for module contents that stores module contents in a centralized database for faster page loading without requiring web server processing.
Page Caching
Allows your site to save the entire page of displayed content in one of three different caching locations: memory, database or disk. Increases page delivery speed for site visitors.
Distributed caching provider
More efficient use of resources in large web farms
File Integrity Check
Checks the files in the installation and reports any inconsistencies that may affect the reliability of the website.
Health monitoring
Periodically registers your website to detect crashes and notifies you of any problems. It also ensures that the site remains in the memory of the web server for faster visitor accessibility.
Security center
A host-level feature that dynamically downloads a list of known security vulnerabilities affecting your version of DotNetNuke and provides a navigation guide to get the latest update
Full Documentation Documentation
Includes over 2800 pages, divided into user and superuser manuals.
Online knowledge base
Provides guidance for DotNetNuke administrative tasks and answers to common technical questions.
Impersonation user
A host-level feature that allows you to impersonate another user who is a member of your website. Locate the user by name, and then click the icon to accept their identity to browse the site using user permissions while maintaining the confidentiality of their password.
Beyond the three elements of caching, I see nothing there except icing on the cake. In addition, using many of these features, they are not as impressive as everyone sounds, and the core of the DNN community is not completely devoid of any similar features. Caching modules, in particular, is available in the community edition, there is only one provider. In addition, page caching is possible in the community edition, it just does not come with built-in page caching providers.