Probably because those tools and electronics aren't expected to last that long, or they are even intended to crap out on you so that you have to spend money to replace them (designed obsolesence). Those manufacturers have no incentive to invest in a good BMS if the consumer doesn't see the value proposition. Also with tools I think there's no real control over the discharge. With electronics I imagine that they could do a better job if they wanted to. With the dollar amounts spent on home energy storage scale items you need the extra assurance of a good BMS, and it's a lower marginal cost. Finally, most of those smaller portable batteries are NMC which just isn't as stable. The home energy storage mfrs who are pushing the warranty envelope (e.g. Sonnen) are using LFP. I suspect/hope that in the coming years we'll see LFP batteries go to 12.5 or 15 year warranties to put competitive pressure on Powerwall. I think that would allow them to price at a somewhat higher $/capacity and still be considered a better deal.