I agree with the first part on it's own. And maybe it was just an oversight or I misread you, but there is a significant difference between solo form drilling and application drilling. If you only do form drilling, yes the mechanics and positions are ingrained in the body, but they won't come out instinctively/'body reacts' unless extensively against outside stimulus via partner drilling.
Yep. You can try to imagine an opponent's force when you do a form, but it is all just in your head, and your muscles can't respond the way they will to actual physical pressure, unpredictable timing, changing angles, and so forth. That's why drilling, and especially, chi-sau is so important in WC training. Most other systems have some form of training to address this, such as push hands in taijiquan, kakie in Goju, and hubud in FMA, etc.
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