IB has a terrible UI but excellent order routing.

Did you try the IB mobile app? It has quite a nice UI compared to the desktop trading software. For example the option chain builder is very easy to use on the app. Obviously if you need all the advanced features then the app will not be good enough.

Agreed the option chain & strategy builder is both better and seemingly more complete on mobile. For instance, there are far more expirations available for futures options on mobile than on TWS.

The IBKR API would likely list them, and I assume that's how people get the most value from using it as their broker.

I'm actually in the process of building a low-frequency trading bot on top of the IBKR API haha.

What's ToS and IB?

Thinkorswim (TD Ameritrade's trading platform) and Interactive Broker.

It’s fine if you do a limit order.

Limit orders are not guaranteed execution.