Hi, bluesrurale, Welcome to the forum!
I think this is one of those questions involving your own risk assessment and personal tolerance of risk. I have friends who have walked caminos this summer, sleeping in albergues. As people have pointed out on other threads, we have not heard news of big transmission clusters from albergues — the covid cases that have arisen along the camino seem to have been primarily in “bubbles” of people walking together.
I personally am planning to sleep only in private rooms. I’m fully vaccinated, but still…. I’ve seen the data on delta transmission. That, combined with memories of sleeping in stuffy albergue rooms with lots of snorers, led me to conclude that it would not be a good idea for me, no matter how far the distance between us. I know the risk of a bad covid case for me is quite low, but having to quarantine 10 days in Spain would wreak havoc with my responsibilities back home. But I have a backup plan just in case.
There are so many unknowns, which make it hard for those who want to do a data-based risk/reward assessment. So you’ll have to find your own covid tolerance sweet spot, knowing that there are no guarantees.
Good luck and bom caminho, Laurie!