Agreed, one can doo harm to seals with either device. Well sort of. The biggest issue is getting grease on brakes unless you totally over grease and pack the whole hub plumb full.
That said, it is definitely more than an hour project start to finish. I’m pretty adept at working on my own stuff and even with 2 floor jacks and power tools an hour would literally be pit crew speed.
But I’m not arguing the virtues of a good old fashioned wheel bearing service. Was just making a funny about the comments that always ensue on this topic. Cheers!!