I got slammed on this exact same topic 45 or 6 years ago! Eveb though I do this and have done reel repair and maintenance for dedcades as part of my Charter service for customers and other guides I worked around. Just like today when DVC says YES IT IS REAL! some think they know more. This is usually because they have limited experience with different models, most can't even tell you how many models of the Stradic there were, or Curado, Calcutta's etc et'c, those models have all been made for over 30 years, and have over a dozen models and year changes.
The new Shimanos are smoother, but in my experience less durrable as some earlier models, as some earlier models were less durrable etc, etc. There seemed top be a time when their reels got better and more robust, then they seemed to get more rfined feeling but that didn't seem to last as long.
I had over 15 Shimano baitcaster at one time, from Bantams to Calcutta's and spinners from Super Speed masters to Sustains. I used to call Shimano and at times just for a screw or friction ring I would get a whats your address and N/C, today a $0.30 screw will cost 6 to 8 dollars after shipping, that is if they even have it!
Today I own 2 Calcutta's and 8 Lew's. I sold the shimaos when it became obvious to me I could by a smoother, better casting reel for less money and buy just as good as the best shimano if not better in the Lew's line. I have and still do have times I call Lew's and if it is a lost screw, a brake shoe spring, a pin, etc, I usually get a we'll just send you a couple, other parts that are more than a few cents I have never been told we don't have them anymore.
But to all those who had all the answers and all those that told me I'd see in 3 or 4 years,, well it's been well over 3 or 4 year, and the Team Gold's, and MG's and BB1's, even my favorite Pike reel the Super Duty, are still going just as strong and smooth as the day I bought em, some over 7 years ago. For the same money, I will still expect better performance, and durability from Lew's!
I will stick with my Stradics, but can see a day like with my Mgfb's that parts wont be their, and if I can't make em, they will be what american's has shown they want with everything, throw aways instead of something that will last, and be serviceable. Kinda like my old 1999 Suburban,, today,, sorry chevy a station wagon SUV combo, should not were the name SUBURBAN! So go's with ShimaNO,,,,,
Until several years ago, Shimanos decades old had parts available to keep em going, but they have brain washed Americans into believing a decade old reel won't do what a new one will today, sadly manufacturers have done this with about everything.