1Password for Windows slowly(!) caught up, and even after all this investment, they decided that going for a web-based UI across all desktop OSes is the better solution.
Tower did not change this: Their Windows version is still lacking, and I am still confused by their website about which features are Mac-only and which are also on Windows.
Are they in a better position now for sticking with native apps? I stopped using them and moved to GitKraken that has the same UI across OSes. It is not as pleasing as that mature macOS version of Tower, but it is still better than constantly switching between an awesome and a "meh" app.
Maybe cross-platform consistency is more important than having one main attraction and multiple sideshows.