No, even if you have an uncompressed block log, your node will compress old blocks before sending them as sync blocks.

So this means your new node will do more work whenever it to provides sync blocks if you don't compress your block log (because it will have to compress the blocks each time they are requested). But the rest of the network will be running optimally in either case.

So the recommendation is definitely to compress your block_log, but mostly for your own node's benefit.