There are several parts to answer your question. First of all - YES, the newer tractors are becoming more difficult to repair. And yes, making them difficult is a deliberate policy of all the manufacturers. It isn't just tractors, it includes cars, appliances and anything mechanical. In some cases - like emissions & safety - manufacturing has even gotten laws passed that favor non-repairability.
It doesn't take a degree in economics to figure out why making something non-repairable is good for manufacturers and several other industries - like the financial ones. The real question is, "Why did it take them so long to figure that out?"
Unfortunately for the world, this decline in repairability comes at a time when repair skills are becoming much less common for everything. Easy to see how that leads to there being more new manufacturing of things not designed to be repaired.
But here is the last part of your answer & it is the promising part: So, for yourself individually.... What do you care? This move to non-repairability works in the young mechanic's favor.
Right now there are a ton of older used pre-computer & pre-emissions tractors on the market and they all are for sale really cheap because they need some work. Stay roughly in the 1970 to 2005 year range.
My generation is getting old. We can't fix them all. So there are plenty out there for you.
As you look around you'll see there are cars, tractors, appliances, tools - and even houses that you can buy from the era when things were made to be repaired. And thanks to the internet there is still a decent source and supply of spare parts.
So grab some tools - might as well get used tools cheaply from a used tool store - and then take a look at what older tractors meet your needs. Don't buy the first one; you can be as picky as you want because nobody else wants them. Same for implements, but more so.
And although the old ones don't have the new plastic Bling!, any tractor post 1970 does pretty much exactly the same things as the new ones. Maybe even better.
Enjoy!
rScotty