It's really quite simple in play. The "by level" tables, love them or hate them, are clearly more complex, by definition, and you're opening gambit here was to claim that people who had aged 4E for years didn't understand the tables. Sort of undermines your point that they are easy to use if people can use the tables for years and not get them, doesn't it...?
Two separate items. I'm not arguing a blanket "by level" tables are simpler or easier. They might be more complex but are easier for me to get the results I'm after (or at least as easy with better results), but I can see why it might not be that way for others.
The argument is that even if the "by level" tables caused trouble coming from a different paradigm, we've had years to figure out what they are good for so why are we still bringing up the worst possible interpretation of 4e elements? There's not even organized play or other externalities getting in the way these days. Use the perspective that makes things work the best and make sense! You don't have to enjoy that perspective or 4e, but I don't see the point of trying to argue that the game should be played or evaluated in the least charitable way if other interpretations exist.
"If you set the ladder at Level 30 DC it's impossible for the Level 1 person to climb"
"Don't use Level 30 DCs for mundane 10ft ladders. DC by level is meant to represent overcoming challenges appropriate to that level and Tier. The fiction should change to match this. A level 1 easy check ladder is always a level 1 easy check ladder, but you shouldn't enounter mudane 10ft ladders as challenges at Level 30. They become window dressing. No need to roll. If you call for a level 30 athletics check it should be an EPIC challenge -- say vaulting from a portal a mountain above the cosmic cube and landing next to it while dodging Level 29 angel guardians. 4e mechanics are meant to resolve around level challenges which match the fictional positioning of that level/tier, maybe -/+5 levels works. Outside of this you can just narrate success or telegraph failure. "
"No thanks. I want ladders that challenge both a Level 1 commoner and a Level 30 Demigod."
Or the Warlord shouting wounds closed argument:
"I don't like 4e because you have Warlords shouting wounds closed"
"Well, especially in 4e hit points represent a lot of different things. Think of hit points more like heroic stamina. Warlords are just refreshing some of that stamina to carry on."
"Nah, hit points are meat points only."
Or prone:
"How can you prone an ooze?"
"Well, it's a mechanic that represents a target having to recover before moving. Most of the time that can be represented as prone but sometimes you have to think of different fiction -- maybe the ooze is split and needs to take a moment to fuse back together before moving"
"But it's called prone so it should be prone."
Since 4e is “mechanics grounded”, can you always come up with an in fiction narrative that is satisfying? Maybe not, but I'd say it's rare not to be able to.
The work to "make it work" is not elaborate mechanical changes but rather just accepting the paradigm 4e operates in.
I can see how people might not like this paradigm, but don't understand the continued denial of the mindset / paradigm that makes the ruleset work best, like using the Level DC tables for Level appropriate challenges rather than "morphing locks" that turn into Epic level locks when you come back to your starting village, or towns full of Level DC 30 ladders.