2dogs -- I should have explained my observation. Headwrench had to open the brake system to install the SBs. But being unsure they were the correct size, the system had to be left open while measurements, comparisons, etc were being performed. I suspect Headwrench has the same number of hands as me (two) so doesn't have a spare finger to put over the opening. So brake fluid will be coming out, slowly, without means to prevent it until an OEM vs SB decision is made. And whatever makes brake fluid (and hydraulic fluid) slippery makes it, in my experience, a bit messier to clean up than engine oil. And it seems to seep into whatever your workshop floor material is unlike engine oil which succumbs to kitty litter.
Once Headwrench installs the SBs then his brake fluid changes will be clean and dry just like mine and the rest of us.
I've had far too much experience over the years doing brake jobs to discuss the issue any further with those who know more than I. It is a waste of effort. I do agree with proper preparation to avoid accidents followed by immediate cleanup which is key to a successful job. If you are one of those who are all thumbs and you know you are, take the job to someone who knows how to do it right. Everyone needs assistance from time to time and there's no disgrace for seeking it. Today things are very different than days gone by. Now you simply unbolt the old one bolt on the new one, fill'er up and go. And by the way, thank you for the kind reply Bert.