My mobile has a very small screen and I have no problem accessing forums with prosilver and no other style for 3.1 and 3.2.
Hard to say, we have no control over when the authors have provided updates on their contributions.
You may find that my Large Font extension of use to you. It is not a style but an Extension that works with any prosilver based style and allows each user to change the font size and/or make the font bold as they require.
Lumpy Burgertushie wrote: ↑Sun Jan 07, 2018 5:53 am styles are maintained by their creators ( or not ). phpbb.com has no control over any styles other than the default that comes with the package.