I think the fact that 74 of these are still considered active is the biggest surprise here. I would barely even say Bitcoin Gold is still active, I literally don't think most of these are even used anywhere other than for speculative trading... Does anybody here actually use any off the Bitcoin off-shoots outside of the top 100 by mcap? I certainly dont know anybody who does.
In this case, active means someone still mining the coins 24/7 (or stake the coins 24/7 if they use PoS) to create block in order to keep the network running
BSV is the only relevant chain, cause it is the refactored original protocol that is the legal and stable true BitCoin.
It makes all other chains the alts.

And i don't remember P2PKH, P2SH or OP_RETURN are part of original protocol, which means BSV also alt.
Your statement only true if BSV perform fork from block
#97304 which created when Satoshi was around (December 13, 2010, 04:45:41 PM)
So you will be able to run old 0.1 clients - that's the thing - nothing changed after the refactoring
BTW: Think of tcp/ip - stability and consens may never change ... it was set in stone and Satoshi told us