Fair point, but I have used Zoom and GoToMeeting’s integrations with Outlook and there may be some similar (or identical) features, but the experience with Teams is a far more integrated experience in Outlook.
As far as I understand, it is Microsoft who are putting third parties at an unfair disadvantage by not offering them the same level of integration.
Further, why leave the Microsoft O365 ecosystem if you’re already using it? Teams offers other capabilities and integrations that Zoom doesn’t have and the Teams integration does not require additional user action to add to Outlook (it’s there by default). Other value adds for enterprises include centralized identity/license/user management via the existing O365 admin portal/Azure AD, singular invoicing, consistent SLA with single vendor, etc. I haven’t looked into Zoom’s SSO integrations with things like AD or Azure AD, but again, that’s another example of resistance for enterprise customers/system administrators.