Promotion (with a pay cut), commissions aligned to corporate bonuses - does that even make sense for sales?

Looking for some insight into whether this is normal, just turbulent times, or bad culture that I should try to leave. I'm early in my career. I had a promotion from SDR to an inside sales type role where I help with renewals, pipeline and smaller deals on some of the strat accounts. The next role is an smb AE.

I was so pumped cos I saw how much the salary being offered was on the job posting (external and internal). Then they gave me my offer which was an increase in OTE, a decrease in Base cos of the split change, and a reduction in my commission cap so that I make about the same as last year assuming I hit (which has never been an issue). Moreover, it's less than the posted salary and they said it's not open to negotiation.... on top of that the cap is explained as being aligned to corporate bonus structures in other roles...but isn't the whole point of sales that we grind it out for higher upside than a damn accountant?? Why go through this stress for the same commission as the Corp bonus...??

Moreover, I found out that people older than me (BDRs who are 35-50 y/o compared to me at 25) are getting paid way more than I currently am even though I was told this is the max we can pay an internal hire.

Is it just me or is this not making sense for sales at this company anymore? Any advice on navigating a career here? I don't want to jump ship cos I want to get to AE here but man, I can't believe they cut my base salary which is barely enough to live on... and they pay external hires 1.5x what I make.