By that logic, you're going to be multiples slower than with TOR vs non-TOR, regardless of the blocksize.
No. With higher blocksizes, disadvantage of TOR mining increases.
It is possible to run a mining rig over TOR to a node that can be a mining pool or solo mining pool. The bandwidth required over TOR is minimal because of the design of the Stratum protocol. The blocksize can be small or large, as determined by the full node and your mining rig(s). The bandwidth required between your site and the mining pool is independent of block size and independent of your hash rate, or even number of mining rigs if you use a local stratum proxy.
Yes, that's a legitimate use-case. I honestly have been talking about solo-mining, which anyway seems to be marginal nowadays.
Unless you 're an ASIC manufacturer, or a huge fan of the sport/hobbie (and can afford to of course),
then SOLO mining is a thing of the past of where we get to tell other people that: I remeber once I used to solo-mine....
It's like the internet (in my case).
One day I will be able to tell my grand kids that I am older than the internet.
That would blow their minds....