Occasionally. very occasionally I need to cut a scarf, but have never found a good way. Here again is shipwright Louis Sauzedde demonstrating how he cuts a scarf. Amazing skill, knowledge and adaption of tools. Definitely worth watching any of his videos if you want to learn more about wood.
Don't think he owns a Festool, but here is a video where he edge preps quarter sawn planks
And one last one, where he demonstrates cutting progressive bevels on boat planking with his circular saw.