There is a compelling (IMO) biblical case for female deacons but only if a church doesn't treat deacons as de facto elders.
In the average Baptist church, deacons have authority. A woman should not be a deacon in that situation.
If a church has elders in positions of authority and deacons do not have any authority, that's different. They may have areas of responsibility (as assigned/overseen by the elders), but I think, biblically, that the role of deacon is strictly to serve in a recognized but non-authoritative role. A female deacon would be well suited for a role of service in a church's women's ministry or children's ministry.
Having a trusted female deacon (tested, approved, and overseen by the elders) in a position to counsel women in sensitive areas can be very helpful in avoiding questions of impropriety. You wouldn't have to deal with the awkward scenario of having a deacon bringing his wife along to discuss a matter with a single woman or with a married woman needing sensitive counsel. Sure, you could have a woman who isn't a deacon fill that role, but having a female deacon do it adds the protection that the person has been vetted and tested by the elders and also is under their supervision. If the female deacon determines that the elders should be involved, she can ask for their help.
Churches that have a "deacon board" or something equivalent that effective serves as an oversight committee for the pastor are, in my view, operating unbiblically, but, if they are committed to that form of church government, they would not need women as "deacons," as the deacons in that church would be in a position of authority.
If a church is elder ruled or led and the deacons have no oversight function and no authority (which is what I think the biblical model is), then I think both women and men can serve. (Although some positions of service would still not be appropriate for women-- a men's ministry, for instance.) I think one telling factor is that, biblically, deacons are not held to an expectation to be able to teach, whereas elders are. Deacons could serve in a teaching role, if the elders approve of it, and it is otherwise consistent with Scripture, but a deacon is not required to be capable of serving in a teaching role. One reason why I think Paul did not list a requirement for deacons to be able to teach is that women can serve in that role, and they wouldn't be in teaching roles.
It is absolutely
crucial on this issue to determine what a church asks a deacon to do. If all deacons are expected to serve in an authoritative role, then they should all be men.