I think it sort of had to be made easier in a way. The player base has such a huge range of ages from all walks-of-life. I think that someone who is 12 won't necessarily have the same experience as someone who is 60. People with developmental disabilities of different types might find it more difficult than someone who doesn't have the same type of disability.
EA isn't made up of silly people. They are a company. Companies exist to make money and create jobs so that others can make money too. Raising the difficulty too far would potentially alienate a portion of the community who may not be able to do the game if it were more difficult and EA would lose potential customers.
Some will say that's a cop-out but I don't think so. There are ways we, who might want more difficulty, can get that without hurting the people who can't play with more difficulty settings. I use a lot of mods. I cheat money away. I play with both my own rule sets that make it harder for me and with community created rule sets.
I know that not everyone wants to play with mods or cheats but I'm just saying...it is an option. When I want more difficulty, I tend to either boot up an earlier iteration of the game (the original The Sims title was more difficult for me as was The Sims 2) or I play a different game that is geared towards more challenging content all-together.
If you feel you've gotten all you can out of The Sims 4, maybe there is another option for you like an earlier version of The Sims or a new game. Either way, I hope you find the joy you deserve for your free time activities.