Sure. Electron or similar tech are doing a very simple thing: they're externalizing development costs by transferring them to the individual users in the form

Sure. Electron or similar tech are doing a very simple thing: they're externalizing development costs by transferring them to the individual users in the form of storage costs, performance costs, and user experience costs, to name a few. Meanwhile, Microsoft is a behemoth. Your argument makes total sense for a small shop with limited bandwidth to test. Companies like Microsoft don't get that excuse. They're simply padding their bottom line at our collective expense, and they can do it because they have extremely sticky services in a lot of areas (in this case, corporate email infra).