Apple

Yes, but.

Overall, yes, leverage the Apple Ecosystem as far as you can - and you can quite far before "needing" alternatives. I have several Apple devices are various stripes and the integration between them is very good/nice. I have a PC (strictly for gaming) and I made some efforts to integrate it with my Apple devices, but as I don't use it much except as a launch pad into Steam, it really doesn't matter much.

• I use Apple Mail and probably always will. I have tried several options, but find Apple Mail works very well "for me".
• I use Apple Calendar and probably always will. Works fine "for me".
• I use Apple Notes for quick jots of generally disconnected information. I have tried many other Notes apps, and so many are just "too much" (Obsidian, for example, is an operating system masquerading as a note app :-) /s). I am happy that Bear recently upgraded to the long-awaited Version 2 and for my heavy-duty note lifting and writing, it's now my go-to.
• I use Pages, Numbers, and Keynote. I have used Keynote to build mid-5-figure and low-6-figure productions (I charged) for large events. It never broke on me during a run, it never crashed, and I made some good dough with it.
• I have used Final Cut Pro X and Motion to edit and release a feature length film. I actually migrated from pre-FCPX (8? 9?) to Adobe Premiere in 2010, used Adobe's terrible products diligently for almost a decadebecause I thought I had to, but finally ditched that shit for alternatives (Final Cut Pro, Motion, Blender, Logic Pro, Affinity Suite, primarily). I just last month finally cut off our Adobe CC subs for the production company, although we kept the Adobe Stock sub.
• I use 1Password for cross-platform password management, but more-often-than-not I don't actually use it and rely on iCloud passwords, which work perfectly fine "for me", to the point that I am wondering if when the next rev of the OS comes out if I can ditch 1Password...
• I have iCloud+/AppleOne because 1. I wanted 2TB of iCloud storage 2. I wanted Hide My Email and VPN 3. I wanted unfettered access to AppleTV (which is great, and I am in the business anyway) and Apple Arcade (which is pretty good, awkually).
• I used to use Dropbox for professional file sharing, but after some privacy snafus on their part, I flirted with pCloud for a while (until I learned that you couldn't "ln -s aName aNotherName" in the pCloud file system). We now have Sync.com as a non-US-based, zero-knowledge encrypted professional file sharing service and I couldn't be happier with it. It is cheaper and more secure than Dropbox.
• I travel extensively and I use Apple Maps almost to exclusion. I also use apps like inRoute and Scenic (I ride motorcycle long-distances sometimes). I have Google Maps on my devices, but never use it (I have de-Googled myself in general, though incompletely).
• I use iMessage and FaceTime extensively and have never had a problem sending or receiving messages (that I am aware of). I especially like handing off phone calls to my other devices (for example, sitting at my laptop or desktop and my phone in the other room rings and I can call or answer on my computer).
• I use Nova (and its sister app, Transmit) for website creation (using Hugo+Bootstrap) and other low-level programming/text operations. I did use VSCode previously, but I am quite satisfied with Nova and happy to support small MacOS developers with $.
• I use Safari almost to exclusion, but Firefox in a pinch and exclusively on Windows.

I have used Linux (at one time I would build my own boxes), Windows (professionally), and macOS for decades relatively interchangeably, but in my dotage I am more and more becoming a MacOS-only user.