Why haven't IRA limits kept up with inflation? original $1500 limit in 1974= $10,132.45 today

The IRA was created in 1974 with an annual limit of $1500, which adjusted for inflation is equivalent to $10,132.45 today, however the current IRA limit is $7500. That was for all ages too. Even the catch up contribution limit boost today is at $8600. still below the original dollar value. Shouldn't we have at least the same contribution limit as our grandparents did? I mean I guess if you want to say the original dollar amount was arbitrary and we shouldn't base today's limits on that, but it seems just as arbitrary today to not have IRA limits the same as 401k limits. theres a lot of workers out there with no work-based retirement plan. something like 25% of all workers don't have one, meaning they get the short straw when it comes to contributing to retirement vs someone with access to a 401k. So how about we start by at least keeping up with inflation at putting the limit at 10,500 ?