A lot of the people who’ve made Star Trek over the years did not care about continuity from one episode to the next, let alone between series.
Personally I find long running media franchises with ongoing continuity fascinating. It’s like the Winchester Mystery House; a beautiful maze like construct with sudden dead ends, doors to no where, abandoned additions, inconsistent design, and occasional Shakespeare quotes. Except instead of one mourning woman directing all the construction, it’s been 56 years of countless writers, directors, production designers, and showrunners all contributing to Trek continuity.
It’s fun to see how everything fits together, and those spots where it does not. That’s just my take, anyway.