I've never had a problem with the bolts although one head is a little hard to get at.
Use good penetrating oil and you won't have a problem.
After personally knowing of three turbos getting ruined by a loose chip wedging in-between the housing and turbine, stopping it dead then heat warping it I would never consider anything other than removing the turbo. Also talked to a couple of guys who decided to remove the turbo after the magnet and greased tap method, both said they found missed chips. That's why all the pyro manufacturers say to remove the turbo, so their butt is covered if you are the one out of a hundred souls who isn't lucky.