Looks like a manufacturing issue!! The TOA's are relatively new and so many serious coating issues allready doesn't seem to be a user related issue IMO.
There is nothing relatively new in TOA/TSA/FSQ. TOAs are in production since 2003... more years than your doublet FS-128.
How do you know about that? or do you happend to know the seriel nr on my FS? and the TOA's involved? I didn't specificaly talk about my FS either but more so of refractors as a whole! Talking about Takahashi only, theres a lot of FC's, FCT's around which are made long before your TOA as are a lot of other brands. Rarely heard of any coating damages. So yes, your TOA is a rather new speci with quite a number of issues allready IMO and I doubt that all are abuse of users. If it were so we would have heard of a lot more from all other brands too I believe.
How do you know that is a manufacturing issue? after 12 years of manufacturing of thousand 130s and 150s, the TOA is a relative new specimen? And why not are the FS-XXN-S-V, TSA, FSQ-ED? being technically contemporanean lenses. The questions you made me, you can make these to yourself. Why you don't questioning your statements?
No need your ns. The FS were produced during 1994-2003 -11 years- and FS-YYN(S)(V) from 2004 to 2006 - 2 years -. The FC 81-94, FCT from 85-98. A good number of 12 years for the TOA, enough to solve any coating problem if this required.
Till now, when I saw a permanently damage in coating was by inadequate cleaning. This includes not only TOA (and I will not write more because then you and some others will make a easy but wrong conclusion)... and all of them by inadequate cleaning.
So strange... people talking about a good matching diagonal for TSA or TOA and suddenly a comment of supposed coating fragility on TOA