^ That is very true, specially when it comes to altcoins. Imagine some small volume thing, it can move 10x in a day and then the drop 99% in a day and both would be very possible when the volume is low and some whale enters. This is why we would not be getting the best result we want.
Same thing could be true for bitcoin, while the volume can't allow anything that large, it still moves, some days we have more volume and some days we have less volume, and that is why we should not be really considering this as a way to get a better result without considering volume into play. I would prefer a high volume increase as well, with high volume, that means everyone is interested in buying it, and I would prefer that a lot more.
While I value your argument and get your point, I don't think this is a real concern in the practical sense of the word. Bitcoin is simply too big, altcoins are pocket change scams. It can not move that much without accompanying massive volume. Further, it should be noted that the volume tracking websites that everyone uses do not have access to all the trading data around Bitcoin. The problem is that there is no good metric. Public exchange data does not include volumes from private exchanges, private OTC desks and P2P trading. On chain data includes some of these like P2P trades but you can't filter the data in any way, so you can't be sure whether something is trade or not.
Therefore, one should always assume that the actual volume is slightly or decently bigger than what is being reported.