Voyager EMH
Slipper Wearing Plucker of Pheasants
The OP expressed a wish to be much better at putting. ("Any advice to become a better lag putter, any drills to try?")I’ve no doubt you are right but … Like 99.99% of golfers I play golf for enjoyment, not for a job, and 3 hours in I would not be enjoying myself (and I’m one of those people who like practicing!). Why would I spend my leisure time doing something boring that I don’t enjoy? I’d guess the vast majority of people would fall into my camp.
In many other fine cognitive/motor skills (think learning a musical instrument) daily repetition even if for a much shorter time is more effective than less frequent big blocks of practice. Would this not be the same for golf anyway?
I suggested one 4-hour session for starters and regular 2-hour sessions. This would be similar to learning a musical instrument, although there are other ways.
In a 2-hour putting session, there can be time for little breaks. The main point is that the mind is focussed on learning and improving by doing for 2 hours.
This is clearly a way to make improvements.
Expecting improvements to occur with verbal instruction and demonstration and very little practice is fanciful thinking rather than practical thinking.
If you have no wish to learn "how to learn" and achieve a higher level of skill, then yes, play golf for enjoyment, and revel in your hit-and-hope putting - its still fun.