Bracketing an argument is useful. Address both extremes. If the concern remains outside all possibility, as indicated by the extremes, case closed.
Sometimes it’s worth taking on the “for sake of argument, let’s assume you’re right” stance. The worst case is, absurdly allowing for mind-reading, Trump actually intended to derail Biden by prompting appearance of investigation ... for which, in consequence, nothing happened. That would be a case of wrongthink, having no actual actionable consequences - extremely close to the line, but not yet crossing it.
Ergo, giving the Dems every conceedable point, there STILL is nothing impeachable. Had Schiff actually waited for Ukraine to formally announce the requested investigation, then he might have had something to work with - but he didn’t. Case closed.