I think they were talking about bring your own device.

How many people bring their own laptop to work? (ignoring self-employed people and the like which this line of thinking really doesn't apply to) Phones should be treated the same way.

Personal devices shouldn't be used for work purposes to begin with. If work has security requirements regarding what phone and what condition it is in, they better be supplying their own phone to ensure those requirements are satisfied.

Vast majority of the people don't have the need for a separate work phone. But they benefit from accessing their work email, Teams chat, calendar, etc. from their phones.

If work wants to be picky about what devices can access those things, but still want their employees to do so, they should provide devices for that. If they don't, well, then the employees get to not do work during non-work hours.

> But they benefit from accessing their work email, Teams chat, calendar, etc. from their phones.

No, they don't benefit (cause it means they check work mail on weekends or evenings), but their employer do...