It could have been nice if we could have Bitcoin in its physical form(paper) so that we can be trading with it while collecting change but this is against the actualization of Bitcoin being decentralized, A\accepting it as legal tender is somehow related to this
We better not have a physical coin because it would defeat the purpose of Bitcoin, which is a digital currency with online transactions that are decentralized, making life easier. Making a physical coin might only complicate things as regulators will certainly scrutinize it, which might give Bitcoin a bad reputation. Well, some people already think Bitcoin is bad, so its reputation is not that polished. But at least we should stick to the main purpose of Bitcoin, which is to be a decentralized digital currency.