&gt; <i>If you turn on smart filters, it&#x27;ll try to club promotions &#x2F; payments &#x2F; forums etc. smartly. It&#x27;d be right 90% time. But my threshold would be less than 1% failure.</i><p>I see. It&#x27;s about as accurate for me, but I don&#x27;t care much about the 10% of misclassified e-mails so I didn&#x27;t even notice.<p>&gt; <i>If you open an email in Inbox, it&#x27;d recommend quick action replies like &quot;Thanks, got it.&quot; or &quot;Lets meet&quot; etc.. It was on spot a lot of times, but I always wanted to add something more to the message and that&#x27;s why I didn&#x27;t use them.</i><p>I totally forgot about it. I.e. I&#x27;ve read an announcement of that feature, but I&#x27;m yet to see it. I don&#x27;t know if it isn&#x27;t available in my region yet or if I just dismissed it and forgot about it. Thanks for reminding me about it.<p>RE apps, I haven&#x27;t seen it done right yet. I still think it can be done well, but developers need to stop doing it via trivial heuristic (frequency of use) or by hooking it up to a global recommender. Hell, maybe I&#x27;ll write a proof of concept over the weekend (and who knows, maybe I&#x27;ll even prove myself wrong, and discover why the idea is pointless).<p>&gt; <i>I think Smartness should be in &quot;Search mode&quot; and not &quot;Action mode&quot;.</i><p>I agree with that. I think ML would be useful in &quot;Search mode&quot;, or &quot;Learning mode&quot;. Actions definitely should be static, so that one can have a chance to develop habits that speed up things.