No, it's actually very easy. Moving 100k across borders with a SWIFT transfer would cost me $20-30 (and I'm a nobody, someone doing that a lot would switch to a business account and pay maybe half of that). And if you time it well (i.e. during office hours for the emitting, intermediary and receiving banks) it shouldn't take more than a couple hours.
And that's using USD. Switch to Euro as your medium and now it's costing you literally nothing or a few cents.
For day-to-day expenses for us common folk that's not really a concern but for big sums of money the recipient will want a little more certainty of the transaction having completed.
This can take weeks with some banks too.
(Source: I work for a major bank)
Bitcoin was designed to have lower fees than traditional payment processors. From the introduction of the Bitcoin whitepaper:
> The cost of mediation increases transaction costs, limiting the minimum practical transaction size and cutting off the possibility for small casual transactions, and there is a broader cost in the loss of ability to make non-reversible payments for non-reversible services.
The current narrative of BTC being "digital gold" and "only for big transactions" is not what it was originally designed as. In this sense Bitcoin Cash (BCH) [1] split from BTC to follow the original plan of electronic P2P cash that works for transactions of any size, including cents.
As for fees, however, Bitcoin does not care how much BTC you're sending in a single transaction, whereas VISA charges 1-2% as a fee. So, if you want to transact in large amounts (tens of thousands to millions of dollars) across borders, it's hard to beat Bitcoin.
Personally I have more faith in Ethereum community to solve the scalability problem with blockchain vis-a-vis zkRollups, Optimistic Rollups, and Sharding. Ethereum already scales to 2,000 TPS and after ETH2 is launched, will exceed 100K transactions per second.