I hope they'll carefully architect it (both base product and extension system) so that heavy features can be turned off, either dynamically (when not needed), s

I hope they'll carefully architect it (both base product and extension system) so that heavy features can be turned off, either dynamically (when not needed), statically (in preferences), or both. If they do so, I'd be happy to have them add such features, because I could optimize the speed / (other) features tradeoff for myself and adjust it for different situations. This isn't a consumer product, and it's not a "word processor". It's a tool for builders, so conventional wisdom about how great designers make the decisions instead of dumping them into preferences don't apply. Great designers of tools like these figure out clever ways of helping users better customize their toolbox.