I've never been asked to fly an assigned track by ATC but it would make my day if it happened. IRS is over 70 years old. GPS has been widely available for over 30 years. Time enough for procedures to catch up to technology. It's been a long time since I saw an IFR aircraft that didn't have at least a GPS, which means 99.99% of IFR aircraft can fly track. Sadly, this is not normally part of training and many pilots don't understand how to do this in their aircraft even though it's a basic flying skill.
It's ridiculous that in this day and age we are using magnetic heading instead of true track, but some day we'll get there.