But then fast forward to the back end of your career and you've got a kind of weird dilemma. The vast majority of ridiculous things that the young guys try to push is absolute crap. They read about it in a blog post somewhere and don't have nearly enough experience to understand the nuances. Or they have yet another stupid f-ing framework that they just know is going to revolutionise the industry. Yeah... been there, done that, my closet is overflowing with T-shirts, thank you very much.
You sit there thinking, "I spent 20 or 30 years fighting my way through this crap and when I finally have a good handle on it, these new guys are just going to throw it all away". But... Dammit. You absolutely know that one of them has a great idea and you're not quite sure which one of them has it. Because they all think they have it sorted (even when none of them do). They feel they are completely sure that "this is the best way and only a moron couldn't see it". But you know that it's always more subtle than it appears. If you let them all run with their ideas, then 90% (99%???) will crash hard... Let's face it -- just like you did when you had that stupid idea that you were absolutely certain was "the way forward".
Anyway, I belabour the point. From my vantage point, it's pretty difficult to let go. Some people just can't do it. In my position now, I have a lot more sympathy for the "old guard" than I did when I was younger. To be honest, I think it is technically impossible for me to have less sympathy than I did -- and I think this is pretty common in the industry. Probably both sides of the equation are in a similar situation -- neither side feels comfortable letting the other side make decisions.
Just talking out of the hole in my head right now, but I think the main thing is that programmers generally like to program. They like to have freedom to try approaches that they think will be successful. As much as possible, it's probably best to allow your teammates, whoever they are, to have the freedom that they need. At the same time you should expect to have your own freedom. Getting the balance is not easy and sometimes you have to change jobs in order to get into a team where you are allowed the freedom to do your best. In my experience, teams that take this seriously are the best teams to work on (even if they sometimes do stupid things).
That said, in this specific context of tech (or at least in my wheelhouse of Ops), this is surmounted by creating and fostering a culture where it's okay to experiment and fail.
Where we've been handicapped in this regard is specifically not doing that, and the particular individual who makes this difficult having the mentality that any new approach spells doom and actively working against initiatives to put us in a better posture of experimentation in environments that don't sacrifice stability and reliability of our stack (hence the sarcastic comment about giving up my first born child for server immutability--I don't even have kids, haha).
But that said, I think you're absolutely right. I'm not quite greybeard yet-mostly because I yank out every grey hair I see trying to establish residency on my chin, but nonetheless your point is accurate, well taken and definitely that has immense merit.
And that means a huge cost of inconsistency. Every time you need to make a little tweak you have to learn how that part of the app works.
When you just want to get shit done, being able to go into any part of the app and knowing it's built exactly the same way as every other part means you don't have to spend any time learning insert X framework, you spend time doing, implementing business rules and fixing bugs.
A lot of programmers want to spend time playing with tech, not doing because playing with tech is more fun then doing the job.
Worst still, juniors (including me back then) are woefully unaware of just how clueless about programming they actually are, as alluded to by the parent, and that means they have massively over-inflated opinion of their views. They also tend to be wildly optimistic about how long a change will take and totally disregard the human cost (the cost of re-training and loss of productivity) of changing a piece of tech.
Meanwhile, you let him make decisions in his module/plugin/part/web service/whatever while you enforce rules between them.
Also, the work off critical path matters too, it would not be done at all otherwise, so treat it like it matters. It won't take juniors ego if older collegues take that job seriously.
As the technical field, we do not follow the scientific method.
Surely we should be looking to engineering here, not to science.