I still don't feel like going traipsing around minefields. I'm sure there's a benefit from tying together all Google services - for me, it just keeps me away from most of them. And I even pay for Google One.
you would think that paying for it would translate into a slightly better level of customer care. But that doesn't seem to be the case with Google. I pay for YouTube premium and I had my fair share on unanswered issues. Not sure about the other services though, YouTube is the only Google product I still use and I have a separate account only for that. Hopefully Google One turns out to be better than YouTube Premium!
So you can have an occasional annoyance but it's not that common.
When I get a new IP (e.g. because I'm upgrading to a newer machine) first I check my IP against a list of antispam filters (I don't want to advertise any of those services, but a quick internet search will show you where you can check, most services have a free tier), if it turns out that the IP has got a bad reputation, I just get a new one instead of trying to whitelist it.
The only time that my email got bounced, that IP was not "clean", it had been blocked by one of the filters but I thought "oh I will just whitelist it on that one filter". I should have generated a new one instead.
One more thing that some people might not know: with all spam filters, if your email is caught by the filter, you will get a message, it's not like you don't know if the email has been delivered or not.
You will see something like "Your message could not be delivered - The mail system [host, ip] refused to talk to me: [reason, e.g. spam]"
In addition to that, you should frequently take a backup of your Gmail emails[3], then in case your account is locked you can use the exported mbox[4] archive, and import it in Thunderbird, this works reasonably[5] well, e.g. recently I had to find an airline ticket from 10 years ago which I had originally received in Gmail, and it took just a few seconds to find it in Thunderbird.
[1] https://support.google.com/mail/answer/21289?hl=en&co=GENIE....
[2] https://support.google.com/mail/answer/22370?hl=en
[3] https://en.wikipedia.org/wiki/Google_Takeout
[4] https://en.wikipedia.org/wiki/Mbox
[5] Thunderbird's search is not as good as Gmail's, but not bad either, I find it does the job for me.