Registering devices with Intune for management and policy enforcement
Your observation brings up some valid points. Microsoft Entra device registration and Microsoft Entra device join primarily describe the device's identity relationship with Microsoft Entra ID, while the actual management capabilities are largely determined by whether the device is enrolled in a Mobile Device Management (MDM) solution such as Microsoft Intune.
An Entra registered device is not inherently limited to "basic management." A Windows device can be registered with Microsoft Entra ID, classified as a personal device, enrolled into Intune through automatic or manual MDM enrollment, receive configuration profiles, compliance policies, application deployments, Windows Update policies, and can even be remotely wiped, retired, or reset back to the out-of-box experience. From a management perspective, an Intune-enrolled registered device can be extensively administered.
Likewise, an Entra joined device does not automatically provide full organizational control simply because of its join state. If it is not enrolled in Intune or another MDM platform, administrators primarily gain identity-related capabilities such as single sign-on, Conditional Access evaluation, and device authentication. Many of the management capabilities typically associated with enterprise administration (including configuration management, security baselines, application deployment, endpoint security policies, and remote actions) require MDM enrollment.
I gather that Microsoft Learn often phrases the distinction this way is that it is describing the most common deployment scenarios rather than the underlying architecture. Traditionally, Microsoft Entra registered devices represent employee-owned (BYOD) devices that organizations tend to manage less aggressively, whereas Microsoft Entra joined devices typically represent organization-owned devices that are automatically enrolled into Intune and therefore receive comprehensive management. In practice, the join type and the management state frequently occur together, making the simplified explanation useful for introductory learning.
However, as you pointed out, this simplification can become misleading because it implies a causal relationship that does not actually exist. Join type does not determine the degree of device management. Instead, it establishes the device's trust relationship and identity within Microsoft Entra ID. The level of administrative control is determined by whether the device is enrolled in an MDM solution and by the policies assigned through that management platform.
A more technically precise way to present these concepts would be to explain that Microsoft Entra registration or join defines the device's identity relationship with the organization, while Intune MDM enrollment defines how the device is configured, secured, monitored, and managed. The join state and the management state are related and often deployed together, but they are separate concepts that indeed should not be conflated.
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hth
Marcin