- Block Size Limit: What is the community's stance on potentially adjusting the block size limit to manage growth? Are there ongoing discussions on this topic?
There are few of such discussion on this forum. But IIRC there's none on bitcoin-dev mailing.
- Second-Layer Solutions: How effective are second-layer solutions like the Lightning Network in relieving the main blockchain? Are there experiences or concerns that we can share?
LN only useful for those who somtimes create Bitcoin transaction, since you need still need 2 on-chain TX (1 to open LN channel and 1 other to close LN channel). Bitcoin sidechain remain unpopular.
Pruning: For those already implementing pruning, how has this impacted your node's resource usage? Any insights or recommendations for others considering this approach?
If you cannot buy a larger disk, then you should apply this now, and put for example 500 GB (or whatever) as your pruning size. But of course, note that by default, your node will send only last 288 blocks (or something around that) to the network, if you use default settings.
No matter size of latest blocks you store, Bitcoin Core only broadcast last 288 blocks to prevent fingerprinting.