It's not a matter of just a few tweaks. It's a few new tweaks each generation, as Microsoft and Intel keep changing their minds on what the "right" way is to put devices into low-power modes, and then not thoroughly documenting those changes let alone upstream them for inclusion in standards documents.
And then there are the hardware bugs which require workarounds in firmware or drivers, and the firmware bugs which require workarounds in drivers, all of which are only developed and tested against Windows.
The set of power management options that Windows 10 exposes to the user has been steadily dwindling to the point that on a new laptop you basically only get to customize how long before the screen shuts off and how long before it goes to sleep. All the more detailed options you had in early Windows 10 or in Windows 7 are no longer exposed, because there's no consistent way to map such controls onto the ever-shifting set of underlying platform features.
Distros don't even automatically install and configure TLP when they detect an internal battery. So yeah, it is 'Linux' that is the problem on laptops.
That and automatically activating a 'small speaker' EQ for when a device is detected to be portable / be a laptop and have internal speakers would be a massive user experience improvement for laptop Linux users.
> Distros don't even automatically install and configure TLP when they detect an internal battery.
TLP isn't magic. More than half of its documented options are inapplicable to current hardware or kernels, and a fair number of the remaining options that could still have an effect are not safe for distros to ship as defaults, usually because they'll trigger firmware or hardware bugs. Installing TLP by default would be far from an actual solution, and isn't even that great a first step toward solving platform power management inadequacies.
And then there are the hardware bugs which require workarounds in firmware or drivers, and the firmware bugs which require workarounds in drivers, all of which are only developed and tested against Windows.
The set of power management options that Windows 10 exposes to the user has been steadily dwindling to the point that on a new laptop you basically only get to customize how long before the screen shuts off and how long before it goes to sleep. All the more detailed options you had in early Windows 10 or in Windows 7 are no longer exposed, because there's no consistent way to map such controls onto the ever-shifting set of underlying platform features.