I can answer why this is at the company I work at right now:
It's a PITA to coordinate between teams, and my team doesn't control the main domain. If I wanted my team's application to run on the parent domain, I would have to negotiate with the crayon eaters in IT to make a subdomain, point it at whatever server, and then if I want any other changes to be made, I'd have to schedule a followup meeting, which will generate more meetings, etc.
If I want to make any changes to the mycompany.othertld domain, I can just do it, with no approval from anyone.
Do they work there or not? I deeply appreciate that everyone's threat model is different, but I'd bet anyone that wants to create a new DNS record also has access to credentials that would do a ton more actual damage to the company if they so chose
Alternatively, yup, SOC2 is a thing: optionally create a ticket tracking the why, then open a PR against the IaC repo citing that ticket, have it ack-ed by someone other than the submitter, audit trail complete, change managed, the end
It's a PITA to coordinate between teams, and my team doesn't control the main domain. If I wanted my team's application to run on the parent domain, I would have to negotiate with the crayon eaters in IT to make a subdomain, point it at whatever server, and then if I want any other changes to be made, I'd have to schedule a followup meeting, which will generate more meetings, etc.
If I want to make any changes to the mycompany.othertld domain, I can just do it, with no approval from anyone.