I tried Tcl/Tk back in 2005 and abandoned it in favour of Qt/QML (and much later Flutter), mostly because UI was so bloody ugly it was embarassing to show to any other user except myself. Has anything changed since then?
AFAIK the answer is an emphatic yes, a lot has changed since 2005. Tcl9 was recently released and has many new features. As far as Tk goes, for a number of years we've had "themed Tk" or Ttk widgets, much better styling, resembles native widgets quite closely. Ttk widgets aren't as configurable as regular ones, well, everything has tradeoffs.
You should take a look at the current releases, you might be pleasantly surprised.
