Typically if you don't have development team, that really works directly with the customer (being mostly silent on random calls doesn't count) - without some kind of project manager, you'll end up with a lot of work done by dev team, which they falsely assume is necessary (unrealistic edge cases, premature optimization, misunderstood requirements).

Most of the teams I worked with, found direct work with customer way worse than some internal alignment meetings.

That being said, most effective teams I worked with(as dev and as supervisor), were managed by ex or active senior developers, who really put an effort into businesses side of the work, so they had full perspective of both sides.

Problem is: * First and foremost - most developers are not interested in this type of work. * Not all are capable * Most of these who do that, internally still uses dailies, unless everyone in their team is on the same level (which is extremely rare due to point one).