I am certainly not a pro. I have only brewed 10 beers and the next one will be my first all grain beer.
I think the answer lies also in what kind of beers do you want to brew. If you like beers where the "malt dimension" is very important, such as lagers, then with all grain you have full control of that part of the beer profile.
If you like more beers where the yeast aromatic profile, or the hop profile, is of greater importance, then you can concentrate on learning on those sides (fermentation, hopping) and postpone AG to a later phase.
If you only used hopped extract so far, you might find interesting to switch to the E+G technique. You steep (or in certain cases mash) only the specialty grain, or a small part of base malt, and you typically do all the hopping/boiling phase. This will allow you to familiarize with long boiling sessions, a little bit of mashing, steeping, whirlpooling, use of clarifying agent maybe, getting rid of spent grains, cleaning of wort coolers, dealing with hop pellet debris etc. without having to worry (or worry too much) with degree of grinding of malt, water profile, pH of wort.
This will also allow you to better choose your gear for the future AG phase: how annoying it is for you the vapour which is produced? How much space can you devote to beer making? How much more time?
When you have had your experience with E+G you will decide whether you want to make it "even more complicated" (but more finely controllable) or to just continue with E+G focusing on fermentation, hopping, adjuncts etc.
If you decide for All Grain, you will make a better informed choice between BIAB, BIAP, Three Vessels. As you have a large patio and no space problem, three vessels might be your better path, if you go AG.
I am switching to all grain because I like learning the process (besides drinking the beer), I have let's say an interest in homebrewing itself, but I would find also perfectly reasonable to go no further than extract (E+G+hopping) and spend the rest of my life in cloning Chimay beers, or other Belgian beers which, for what I read, can be reproduced with extracts with a good degree of quality, or very dense wort to make Imperial Stouts, Barley Wines etc. for which it makes sense to make use, at least partially, of extract.
If it's Pilsner or Helles you are after, all grain it's the way to go.