This is 100% not true. Companies don't have to put themselves in a position to be bought to have offers thrown at them. There are literally 100s of examples of this. Every company can be bought for a price. That's primarily the mismatch. This is the reason Instagram and Whatsapp sold for the prices they did at the time they did. When they were bought, everyone was shocked at the obscene sum of money for such a small team. In hindsight amazing purchase, but at that time Zuck had to throw an obscene sum at them to get them to say yes.
Also public companies have a fiduciary duty consider *all* offers and see if its valuable for shareholders. At a certain price, it will become a, no brainer, extremely valuable offer. The only other hurdle is getting the ok from regulators which is where they are stuck now.
The rest of your response hinges of the fact that we don't know the unknown variables and therefore the decision is not simple. But this argument could be made for literally every decision in life and we would all be stuck doing nothing. We have to make decisions based on what we know and accept that there will be a margin of error. Ideally we also know all the risk factors but that's literally impossible.