Fury efficiency is not the only relevant metric, you spend less of your fury during proc or DS windows if you use ToC instead. You gain very little by spending SFs without procs so you want to spend them efficiently in procs. You will generate more than 10 procs and 1k fury in 2 minutes before your DS dumps. I have no idea why you have spent the past 10 pages arguing against this point when basic logic just proves it wrong, despite whatever your spreadsheet says.
Literally no one is saying to not plan for spending SF and Fury. Literally nobody has said that. However, you have to spend efficiently between and ToC is just less efficient if you can avoid it.