I agree with your statement.
There exists a boundary between the taxation of cryptocurrency (which would benefit its users as it will provide a layer of protection and regulation) but it will defeat the very essence of it being decentralized and its anonymity factor. Bearing this in mind, is it worth to sacrifice decentralization for protection and regulation by the government? The answer will vary depending on an individual's experience but taxation in cryptocurrency defeats the vision on what Satoshi imagined when he developed this technology.
I guess the phrase 'getting the best of both worlds' is not applicable (at least for now) if we consider these circumstances surrounding cryptocurrencies and the intervention (taxation) by the government.
Exactly. Taxation goes against what Satoshi intended crypto to be in the first place. A cryptocurrency like Bitcoin was meant to serve as an alternative to the current financial system by eliminating the middleman. Taxing a person's crypto transactions, will make Bitcoin no different than regular Fiat. But I guess that most people will prefer to comply with taxes as they have no other choice. It's better to cooperate with the government instead of going against it. You'll be facing fines or even jail time if you avoid taxes on your crypto transactions.
Since people don't care about the decentralization of crypto and Blockchain technology, they don't protest against crypto taxation. Remember the phrase, "strength in numbers"? If a substantial number of people join themselves together against government-imposed taxes on crypto, they'll stop doing it. But as long as people remain quiet and do nothing about it, governments will continue with the endeavor. One thing for sure is that privacy-oriented coins like Monero and Grin are in real trouble, since it's largely impossible to track & trace transactions for taxation purposes. Only Bitcoin and other cryptocurrencies with a transparent blockchain ledger will survive for the foreseeable future (as governments will approve them in every way).
Nonetheless, I believe that the battle over crypto taxation will be a never-ending one. For once, governments were unable to tax crypto properly. But with the increasing number of centralized exchanges, it's becoming more easier for governments to tax their citizens. The dependency on centralized services by crypto has only made matters worse for the end user. In the bright side, crypto and Blockchain technology will continue to grow in terms of development and innovation. But, it won't be the same as centralizing forces will have a negative effect over people's freedom in day-to-day transactions. Just my opinion