The diminishing returns kicks in these days very early when it comes to tower and large loudspeakers.
Personally, I wouldn't be in the market for new tower speakers in 2025, but that's probably (definitely) due to the fact I have more loudspeakers than I will ever need for several lifetimes. The issue as I see it, is there is no need or desire for manufacturers to really compete or show-off anymore. At the height of the late 80s and into the 90s, the big manufacturers threw tons of money at R&D and produced some absolutely incredible loudspeakers that made it to market as heavily-subsidized "halo" products, where smart audiophiles could buy speakers at a fraction of what they really should have been. It was all about the trickle down sales where the numbers and profit was.
Freight costs have skyrocketed and transit damage for large speakers is not helped by all the BS "sustainable/environmental packaging" that does little to protect the contents when compared to the overkill packaging used in the past.
Tower speakers sold today are boring designs mostly, with a pile of mostly identical "bass" drivers, cheap tweeters and 2.5 style crossovers etc.
I miss the designs with push pull internal woofers, large 12" to 15" actual woofers, separate mid/treble pods, rock solid cabinets and gorgeous piano/gloss rosewood finishes. Even 10" woofers mean a tower is out of the question, unless side firing, so people wanting a "tower" style are stuck with several small woofers which despite all the effort in marketing them, never sound as good as a single large driver.
If I wanted a new pair of speakers, it'd be the Yamaha NS-5000s (circa AUD$20k here), but they aren't a tower, they are a "bookshelf" LOL...