A YouTube channel called PBK Reviews has posted a video showing the dissembly of a Pixel 5. From this, it seems that fixing Google's latest flagship smartphone is more or less doable. This process starts by removing the display, as with its immediate predecessor the 4a (albeit through a less convoluted method).
It should be noted at this point that the 5 has a cable that remains connected to the main board when the display is lifted off, much as in a recent iPhone 12 teardown video. However, the removal process appeared fairly straightforward besides that. PBK Reviews did not encounter any sign of the "screen-gap" issue that has reportedly plagued other units of this phone, however.
On this note, the phone was shown to have markedly large display clips and an appreciable amount of adhesive. The vlogger speculated that phones with the recent hardware issues might have less of this than most, thus increasing the risk that the display might come away from the rest of the phone.
Otherwise, the video seemed to demonstrate that many of the Pixel 5's components can be removed with relative ease, even the battery (which has a graphite film overlay for thermal management) despite the lack of a pull-tab of any kind. Therefore, a user might be capable of replacing its display, cameras (punch-hole selfie shooter included), microphones, main board and bottom speaker, as well as the battery itself.
In addition, the phone is slated to remain supported with regular Android updates direct from Google for 3 years post-release. All in all, the Pixel 5 may have the potential to stay out of landfill for its lifespan and beyond.