We don't disagree on applications. Too many people expect miracles.
But maintenance on a solid state device? No moving parts on the soft starter, bypass contactors never make or break FLA, they end up lasting virtually forever. I have taught many classes on soft starters, here is my take on repairs / maintenance.
In an electromechanical contactor, what can go wrong? A bad coil or welded / worn contacts. So if it doesn't work, you have basically two things to troubleshoot and possibly replace. If a soft starter quits working, it can be a shorted SCR (equates to a welded contact) or a bad circuit board (equates to a bad coil); still only two possible things to replace. Better yet if it is a bad SCR, the controller usually tells you as well! Granted, shorted SCRs are not as easy to replace as a set of contacts, but they don't "wear out" either. If they don't get hit by lightning, they can outlast most of us living today.
It's not necessary to troubleshoot a PC board down to the component level, it's rarely worth the labor time any more; just swap it out. Most manufacturers make that very easy now; plug-in terminals, keyed receptacles etc.