[saidajigumi]

To clarify, I'm fully aware that there's business to be had related to legacy browsers. I'm not arguing against the business case. If you've got a significant customer base with this need, then you'll have to choose tools that let you deliver.

To rephrase, makers of new tools, as a rule, tend to be forward-looking. This is what I'd expect. As corollary to this, at some point it no longer makes sense to support legacy technology. This produces a tradeoff within the aforementioned business case: is it worth the product constraints, effectively an externally imposed technical debt, to support that part of your market? How will you fare versus your competitors going forward if you do, or do not, support the legacy tail?