I actually love the drill/feed aspect of private lessons. If I never played another match ever in my life, I actually wouldn't mind much.
I guess it's fun to try your new strategy/technique in the field, (like trying to go to the net, or having a serve that is not a liability), under game conditions, I often find I revert back to old habits. To me, this means the lessons have not yet become muscle memory, which may take years, since I'm basically relearning the entire game. No one gets good at tennis in 2 months.
So, in a way, I prefer the delusional Truman show bubble of lessons, instead of the reality that not much has changed once you're not getting nicely fed balls
You aren't deluded IMO.
The reason why you shouldn't dive straight into competitive play if you want to be a good player is that because competitive matches don't give you consistent balls (and why would they when it's advantageous not to), you end up developing and grooving a unique stroke that gets the ball in and also fits your movement and contact point.
And because most people will only put in the minimum amount of effort needed to get a ball back, both the contact point and the movement in such players will be minimal, since one necessitates the other:
- Minimal movement means you will be either too late or too early to the ball, meaning that the contact point will almost always be too close to the body. What I mean by this is that players will either duckwalk to a ball that's coming right at them--causing them to hit the ball whilst jammed (late prep certainly makes this worse)--or sprint to a fairly slow ball and stop too late (if at all). This is why they will pretty much always be hitting the ball too close to their bodies. I'm speaking from experience here.
- Because hitting the ball when you are jammed is difficult to do, players will develop a stroke that works no matter the situation (by 'work', I mean getting the ball over the net, nothing more than that). This will almost always be some sort of dink shot, because he larger the overall motion, the more room there is for error--and the dink shot is as close as you can get to a 0 motion stroke. You move your racquet face to the contact point and allow the ball the bounce off of it, as you will be producing minimal follow-through.
However, advanced players with proper technique aim to do the opposite--they want to be hitting the same shot (their best shot) no matter the situation. See Rafa, for example, who will go to extraordinary lengths to hit a forehand. This is why footwork and movement are both so important--because you can't hit the same, ideal shot unless you are in the same, ideal position.
In other words, lower level players let the situation dictate fully the development and quality of their technique, since because they never learned what correct technique is, they are forced to become accustomed to a disadvantageous situation and developed the best shot they can that will allow them to hit the ball back from there. Advanced players however, will know what the 'ideal' shot is, and move themselves in the correct position to hit that ideal shot. Players with no formal training will wait for the ideal ball to come to them; players with formal training will create the ideal ball by moving themselves to the ball.
IMO, this is also why people who have received training for an intermediate number of years, say 2-3 years, are in a bit of a pickle--assuming that they don't have one glaring weakness (eg inability to hit a second serve), they possess the looks and technique of 4.5s and higher, but haven't yet got the movement of those players. They will therefore be unable to employ the ideal shot as often as they would like. 3.0-3.5 veteran pushers however, have almost an unlimited margin of error, not only because they have long given up on hitting winners, but because of their minimal swing, there is no room for anything to go wrong, and will therefore be able to bunt balls back all day. They've been hitting from a disadvantageous situation from day 1, and have made that their ideal shot. If your ideal shot is to hit late and jammed, then there is very little others can do to make you uncomfortable.
Eventually however, your movement will improve, and once you are able to move yourself to hit the same ideal shot every time, you will be effortlessly wiping the floor with anyone who isn't technically better than yourself. So no, you aren't deluded. You can take the short, easy path and become an very good mediocre player, or you can take the long, difficult path and become a mediocre advanced player--maybe even a good advanced player. But as everyone knows, it's a long and difficult journey, so the guys who choose the easy route will be seeing less satisfying success a lot sooner and for longer before you hit your stride.