Depends on climate, I guess. I'm in London and here the far greater problem would be moisture and not heat dissipation.
Deploying updates is not that hard - you'll want a flash that's large enough for at least two partitions so you can keep a known good version around. Other than that, signing updates isn't a big deal, and tamper-proofing key storage enough for casual use isn't that hard. I wouldn't trust sending senstitive data clear-text over a network like that, but I wouldn't do that over public wifi anyway.
Latency is a bit more of a challenge if you're somewhere that'd need lots of hops, but if you are then presumably the alternative is worse, especially if you have nodes with LTE connectivity as a possible fallback.
Deploying updates is not that hard - you'll want a flash that's large enough for at least two partitions so you can keep a known good version around. Other than that, signing updates isn't a big deal, and tamper-proofing key storage enough for casual use isn't that hard. I wouldn't trust sending senstitive data clear-text over a network like that, but I wouldn't do that over public wifi anyway.
Latency is a bit more of a challenge if you're somewhere that'd need lots of hops, but if you are then presumably the alternative is worse, especially if you have nodes with LTE connectivity as a possible fallback.