I would bet that for most users, improvements have brought very little. Trading hasn't changed since 2005 or 2001 .
You still do the same things whether it's placing multiple orders, spreads, entering stops etc. No need to overcomplicate.
TWS is simply too complicated to use now, (go watch their seminar, even the seminar hosts sometimes get confused)
while still lacking some very very basic features such as for example , a portfolio page that sorts and SAVE position order by type (stocks , futures, options, optionspread etc.) an FX P&L window separate from your currency holdings, a real charting platform that's easy to use and save. I could go on and on . Development is downright stupid, they have no respect for customers. Every release puts your dollar at risk, they are a hazard to your account and really your health.
I am saying we need the SEC to impose rules on these electronic brokers that they have some kind of fiduciary duty to provide a stable platform to their customers and not chase technical improvements for the benefit of the shareholders and owners.
Because these are the people who really benefit from those improvements , al lthey want is build the most technologically advanced platform so the company's assets are more valuable and they can be bought out and get filthy rich.
The interests of the customers and the developers/company executives are not exactly aligned as they should.
The SEC needs to tackle this issue and soon.