“Cool to look at” is fine and dandy if it will boost subscriptions. 
HR drift is quite apparent in the current Xert chart format and easily isolated against power using the chart’s key icons. It’s easy to see differences between interval sets indoors, but I’m not sure how well it works for outdoor rides.
@xertedbrain is asking someone to provide an example of what you want lap analysis to look like along with an explanation of what it does.
A mockup, screenshot from another app, or whatever visual example you can come up with would be helpful.
I have never used laps in the past so I am not sure what you are expecting, but my thought was there would be a lap analysis button on the activity’s chart view that is normally greyed out if no lap markers exist in the data. If markers exist then vertical lines would be shown on the chart to easily ID lap sections for the entire activity. If you click the analysis button a new view would pop-up that overlays (or stacks?) the laps sections and displays comparative stats. I think an overlay would be the best option with a key below labeled Lap 1, Lap 2, etc. so you could enable/disable which laps you want to compare. The default view with all laps enabled would indicate the overall pattern and variance. You would also need ability to select which data sets you want to compare (Power, MPA, Cadence, HR, anything else?).
If this feature is viable to implement then EBC needs a lap function as well.