>> Why is it irrational to prefer a single battery platform? Cost and accessory compatability. Here's a real world example: if your 18v tools are Bosch and you

>> Why is it irrational to prefer a single battery platform? Cost and accessory compatability. Here's a real world example: if your 18v tools are Bosch and you want to add a track saw to your arsenal, then the Bosch track saw is excellent (it's made by Mafell) and it has the best rail system - specifically the joiners are more reliable than the Festool/Makita/others style. It'd seem a no-brainer to buy the bosch 18v track saw then? Rationally, the Festool track saw is the better purchase: it's cheaper (even allowing for purchasing 2 festool batteries + a dual charger), it has a deeper straight and bevel cut depth, and Festool tracks are a defacto standard for track accessories - accessories that would not be available to you on Bosch/Mafell style tracks.