Good point. It also exposes Lutherans to the heterodox positions of those Reformed communions, particularly in the area of the Eucharist. And let’s all admit it, we don’t do a good job of catechizing our members. So, the exposure leads to Lutherans believing things that are not doctrine.I was also dismayed when the ELCA declared full communion with Reformed Christians. But then I realized that exposing other Christians to the Real Presence as believed by Lutherans [as well as infant baptism, holy absolution, weekly mass, etc.] provides them insight into the mysteries of the faith. The efficacy of holy Communion is never determined by individual understanding.
Saying the efficacy of the sacrament is never determined by the individual’s understanding is true, but is not a reason to allow heterodox understandings to confuse the faithful.
Jon