Sounds great! There are still a few rendering bugs to iron out (e.g. this one), but once I have those fixed up we could add it to core. I think I’d still prefer to test it a little longer on Meta though. The current implementation has only been live for 24 hours.
Taking a look at a few other popular PWAs:
| Service | Immediate whole-page change | Slider | Spinner | Custom placeholder |
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| YouTube |  |
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| GitHub | |
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 Old Discourse |
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Discourse with Slider |
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So this change would make us more like YouTube and GitHub which, IMO, feel more like websites than apps. Is that a direction we want to go? 