if you want arbitrary data on the blockchain. then never dare enter a debate about bitcoins blockchain is too big.
if you want arbitrary data on the blockchain. then use a blockchain thats not aimed to be just peer-to-peer cash

those that do argue that blockchain is too big and that other networks are needed to take the burden off the network.. but then go on and say that adding arbitrary data is ok.. are just flip flopping

they need to go back to basics and research the whole point of bitcoin. learn its usecase and then stick to the single narrative of that usecase. rather than promoting other features unrelated to the use case and then promoting other networks to provide the usecase, to then make bitcoin not utilised for its usecase and instead promoted as something different

Bitcoin is not intended to be a notary blockchain service, there are plenty of alternative choices for that service, the best being Deep Vault which even has browser plugins to make it easy