Not a huge fan of the blade chassis vs. individual servers. Cleaner cabling, but software/firmware problems can kill the whole chassis, and you're locked into a single vendor.
I rarely run out of RUs before I run out of power on anything. Maybe it would be different with ARM-based blades.
Real hardware, though, vs. cloud, pretty easy case to make for a stable load app.
These aren't blades and I dislike blades for the hardware/vendor lockin reasons you mentioned. Blades usually share power, network, etc. These only share power + baseboard management controller. We can lose a single power supply and still keep on going. We've distributed the applications over multiple chasis, just in case though.
The BMC is horrible. It needs a cold reset frequently, and it often doesn't work at all when access from a non Windows machine. Otherwise they work really well. I like that the sleds are able to be removed from the front too.
I rarely run out of RUs before I run out of power on anything. Maybe it would be different with ARM-based blades.
Real hardware, though, vs. cloud, pretty easy case to make for a stable load app.