If you think the added convenience of a smaller physical size is worth losing much of the beauty and smoothness of motion (without even going into things like historical accuracy or respecting the original artist's vision), that's one thing. But claiming that LCD is practically indistinguishable from CRT, is... a weird thing to say. Anyone can spot the difference, and when talking about smoothness of motion, the difference is actually even functional. Try reading scrolling text on an LCD, it's very difficult, whereas on CRT you can see all individual pixels as clearly as if the text was stationary. Well at least if it's a smooth scroller anyway. Maybe it's not a big thing on the MSX, where smooth scrolling was rare to begin with? 
I have yet to see a C64 or Amiga scener who doesn't greatly prefer CRTs, because that's where you can see the original magic you fell in love with. The smooth full framerate scrollers, copper bars, vectors, ...
Please on-topic, Are we sure that VG-8235 is not upgradable to 2plus?
And if it is possible, what is the best way to do it ?
I don't think there's such a thing like "This VG-8235 cannot be upgraded to 2+".
That's a VG8020 and it's now a MSX2. I am 1000% sure I could make it into a MSX2+ if I wanted to.
The point is, you need to do different things based on the original design of the computer you're working with. I don't think this is something you can do with a simple "cake recipe". You just need to react to the problems as they show up. :)
Guys, I have the solution for converting an 8235 to v9958:
It was found as hand drawn comment in an old schematic, which was scanned and kindly provided by Hans Oranje.
Luppie is right. There are variations in the models around.. The VG-8235 video circuitry is, in my opinion, a mess. Especially on the /00 model, you'll see a yellow MSX logo turning white on power on, due to the poor RGB amp section.
Equally poor is the CSYNC section, which causes a voltage offset feedback into the V9958 that the chip can't handle.
Solution: Remove R40 (underside, smd, 820 ohm). Create a 'stack' (parallel) of one smd 100k resistor and one 220nf capacitor, size 0805 if I recall correctly. The value of the cap doesn't matter so much. I think I used 1uf. Solder it to the R40 pad connecting to vdp pin 6. Then put the original 820 ohm in series with those and use a wire to connect back to the other original pad of R40.
Presto: perfect MSX2+ video output on the 8235 (well perfect.. still the off white balance on power on happens).
