Planning to use FSMOne platform for RSP ETF as its probably one of the cheapest platform in the market now. However, should there be a new platform with even cheaper fee/better benefit in the future, how can I switch over to the new platform?

I'm switching from FSM to TDA. Just need to write letter of intent to FSM about the switch and it take few weeks to switch over, quite straightforward. However, mine still in process, may update again if there is any hiccup happen

So many fees dropping generally step by step with the mainstream choices.

Possibly the current fees are already irrelevant with the typical mainstream brokers and a dedicated Buy & Hold for ultra-longterm approach.

Then it gets more important whether your broker allows You to trade on the U.S., China and Europe stock exchanges ...