> I think we have to let go of the "just get more ram" approach and start optimizing webapp code like figma does

I think you're underselling how much work went into making Figma that way. You're talking about a completely different realm of optimization that most companies won't spend money doing, and most web programmers won't know how to do.

As long as there's no incentive to do otherwise, companies will slap together whatever they can and ship as many features as possible.