The Whirlwind used Rolls-Royce Kestrel engines that were at the end of their development potential and were unreliable. Westland's decision to use Kestrels left no development path forward that didn't require extensive and expensive redesign to use the heavier Merlin engines. That doomed the Whirlwind's longtime viability.
See Westland Welkin.
In all of the books I've read on the Whirlwind, the reliability of the Kestrel was never mentioned as a problem. Power (or lack thereof) and further development potential, yes. But not reliability and serviceability. A lot of what killed the Whirlwind was politics, too, and inept company management.
The reality is, though, the pilots that flew them loved them. They did very well with them in very high risk missions, fared well against the German fighters they encountered, and ultimately decried being forced out of them when they transitioned to Typhoons. They loved their Whirlwinds, and with good reason.
Later development doesn't matter much when you consider the Whirlwind's actual contribution while it was in service. The Brewster didn't have much future beyond EW, yet it's contribution was enough to warrant addition, and it's no hanger queen. The Whirlwind would be just as deserving, IMHO. And would likely be just as widely used, maybe more.