Phone, tablet and laptop glue

It seems to be the thing these days to build gadgets with glue rather than screws, so that all the bits like LCD, digitiser, battery and case are stuck together. This has caused much bewailing by the likes of iFixit, because things aren't fixable by a screwdriver any more.

I wonder whether the problem is that we need new tools and new approaches, rather than just giving up. For example, heat gun techniques seem to me a bad idea, because the heat goes away easily. It you're trying to lever the screen off with a few dozen guitar picks, that also places stress on the screen.

So I wonder what's a sensible heating method? For example, there's the 'hot pillow' approach:

Heat up pillow in microwave, apply to surface. For some reason this is a small pillow - I would have expected a better one would be the size of a dinner plate or larger, enough to take a whole tablet in one go. Or would that induce heating stresses in the screen?

Another approach is the temperature controlled table:

possibly with vacuum (either integral, or simply invert then use a sucker).

I wonder what kinds of household appliances could be abused to do the job? For instance, there's a nice use of toaster ovens as PCB reflow stations - just add a PID temperature controller.

Anyone done this and have any tips?

Thanks Theo