I don't see it that way at all. In order for there to be no need for a public enquiry you would have to accept that all of the following were true:
1. There was literally not a single thing that could have been improved on, given what we know now;
2. There was literally not a single decision that at the time could have been improved upon;
3. The decision-making process functioned as a perfect fusion of science and politics;
4. The decision-making process and its outcome were perfectly transparent;
5. The implementation of these decisions was flawless.
The fact that the Tories were in power is, to my mind at least, more or less irrelevant. They drew the short straw (or we handed it to them). Moreover, the fact that some of this is hindsight speaking and some is what could, or should, have been seen at the time, is what a public enquiry would be able to sort out. There is no sense in universally defending the decisions of the last few months.
There will be another pandemic in the future. Several more, in fact. We can't walk into those future threats without at least trying to learn something from this one.