On the contrary from all we know it probably made you better at memorising.
Similarly being able to write cursive gives you better fine motor control in your writing hand.
I learnt cursive at school, as well as use of a slide rule and log tables. They were obsolete by many decades when I was learning to use them. But are my arithmetic skills worse than the average zoomer who has a smartphone practically cemented into their hand?
No, I'm fact I'm probably more efficient at using the calculator app on their phone.
In theory computer algebra systems have obsoleted junior maths courses let alone times tables (multiplication tables). But good luck using one if you didn't do the wax-on wax-off leg work of memorising seemingly useless data.
In my current job I oversee trainees who have to sit 3 exams (at great cost totalling about 10k). The recommended reading for those those exams is about £25 question bank. Everyone who does it comes away feeling it was useless. The vast majority will pass and tell their more junior friends not to bother with it. And invariably the group that doesn't use it has more fails. There is bias here, those that are willing to work are more motivated and more likely to pass. But this always reminds me that 1) you don't even know what you're gaining when you do any kind of training 2) we rarely remember how we know something or why we came up with a particular idea. Usually the reason is some boring combination of seemingly unrelated grunt work.