For sure there are gains to be made by having proper material as opposed to entry level, but those quickly become marginal.
The biggest gains by far are usually found in working on your driving style. Have a look at telemetry of someone who's slightly faster and work out the differences methodologically.
Shameless self-promotion: if you're racing in iRacing, have a look at https://garage61.net, we have over 125 million laps of telemetry to learn from.
Not much feature development is perfectly fine if it works! Things don't have to evolve.
Planning to use litestream as a library to dynamically swap in/out dozens of databases in a process. Looking at the code it'll easily allow that (super clean, kudos!).
So many thanks, it's going to enable a lot of new things!