Certainly not illogical, however the install process detailed on the PD Creative website does not look too daunting at all, and several members here have already had their units open both to inspect the condition of the electrolytics, and in at least one case, to go ahead and install the adapter board.
So it's not exactly uncharted waters, though I concede that different members will have different thoughts about taking apart and removing an internal PSU, but it's a few screws and two wiring harness click connects, and that's it.
As far as sound quality upgrades go, while I have never performed this specific modification and indeed have never owned any Bluesound product, I also know that the huge skepticism of power supply upgrades on "digital" products is almost entirely unfounded.
PSU upgrades can and do make a difference with "digital" products, it's not all just ones and zeros, and I'd imagine this upgrade would improve sound quality as described by some in the U.K. using the Fidelity Audio adapter board installed by
@OldNuke , along with an external LPSU, or the Polish adapter board linked to here and elsewhere, both when using the unit's internal DAC, and possibly when used with an external DAC as well.
The Polish seller makes mention of various positive mentions on fora in the U.K; France, Finland, and Poland. I'd love it if a member here could contribute a N. American perspective, however it makes sense to leave well enough alone unless one has a unit that is in need of repair, or the owner is just curious about trying to extract maximum performance from this platform.
Whether one considers the spend involved to be big or small, or the perceived performance improvements (or lack thereof) to be big or small, that's going to be largely subjective, though the Polish seller does list some objective measurements on their site to support their product claims, but they don't say which external LPSU was used to generate those measurements.
If the main logic board itself has switching regulators on it, it probably doesn't make much sense going nuts with an expensive LPSU, unless you already own one and it's sitting there unused. If so this would appear an inexpensive way of upgrading and repurposing. Otherwise, I'd suggest the $59 yet superb performing Allo Nirvana SMPS as the external supply, coupled with the adaptor board, solving the reliability issue while likely boosting performance at the same time.
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