Heat looks like validation, and validation looks like safety. It is hard to ignore a sector when customers start leaning forward at the same time investors do. Still, the more cycles I have lived through in competitive technology businesses, the more I see heat as an optical illusion. It sharpens whatever is easiest to notice and blurs the underlying mechanics that determine who or what holds control.
Since expenses for external advisers are not reimbursed if a deal falls through, PE firms wait until they are certain of their interest before engaging costly specialists such as consultants from McKinsey, BCG, or Bain to perform extensive commercial research on the market and the target company.