My guess is if you have developed 100's of rolls of films without problems then your method works for you, so if you are confident that you can develop film with predictable results why change?
I have been using tow of my fingers as a film squeegie (sp?) for nigh on 40 years without any problem. I just make sure my fingers are not dry, and have never had a problem. My fingers are sensitive and before I start I rub them together to make sure there nothing that can scatch the film.