The only time I've seen cross-platform webtech save meaningful amounts of time and money is when corporate weenies insist that the program look identical on eve

The only time I've seen cross-platform webtech save meaningful amounts of time and money is when corporate weenies insist that the program look identical on every platform, rather than letting you use a native look for most of it. Styling every single input to look identical on every platform does indeed waste a lot of time—but that's not native's fault, it's the "everything must be On Brand at the expense of all other concerns" people's fault. Meanwhile I very much doubt the customer gives even a subconsious shit that your "app"'s radio buttons look identical to the (also custom) ones on your website. They probably do give a shit that they look unfamiliar compared with natives apps, so take a little more mental energy to process, and they probably do give a shit if your theming introduces any jankiness that wouldn't otherwise be there (and it very often does). But, yes, that level of making everything look and behave identically everywhere is far easier to achieve with webtech. But you could... just not, instead.