Yes, the most perfect reason to go to Church is because you love God and want to be with Him both now and forever. However through the years that love motive waxes and wanes and grows stronger and weakens. We are all sinners and from time to time there are those who go on Sunday’s to Church simply because they don’t want to go to Hell and there is an obligation to attend Mass and keep the Sabbath Holy. It takes work and sometimes we fall short in the motivation dept.
Folks like cripples, the sick, new mothers, the blind and the elderly, etc. can either get help getting to Church or have a Communion Call made to them by either their Priest or Religious or some other Extraordinary Minister of Holy Communion. When they are truly homebound or in hospital, then God doesn’t hold it against them and the Church follows God’s lead. Folks in Alaska have a hard time getting to Church and when our country was young there were miles and miles to travel to attend Sunday services, some had to leave their farms on Saturday and got to town then and spent the night to go to Church and would leave afterwards for the trip home. Dangerous and time consuming. But they did it. There are folks who use a half-hour drive as an excuse to not attend. Or the weather. But slackers will slack. I’m not a slacker and I suspect you aren’t either Even. But devotion over time takes work and stick-to-it-tive-ness.
As for your last question, I am disabled and there may soon come a time when I too will need assistance in my Mass attendance. I pray that never happens, but I have a seriously debilitating disease that could rob me of my mobility. It has twice already. It is my daily reality. When and if that happens, I’ll deal with it same as everyone else who has mobility issues, etc. Pray for me.
Now about another ancillary issue to your question. If a person isn’t impeded in any way and doesn’t believe in going to Church and stays home for that reason, then yes, they are committing a very serious sin. It is both against the Commandments and the Church’s Precepts to do so and they would be in mortal sin. They would have to go to Confession for it and at least be willing to give that up to receive Absolution and the ability to receive the Eucharist once again. Mortal sin and venial sin is something you are probably not so accepting of because you aren’t Catholic. Silly me - there are Catholics who disagree with that and find it hard, but those of us who take this stuff seriously DO. I do. I believe all the Holy Catholic Church believes and teaches because God has revealed it Who can neither deceive nor be deceived. I love the Act of Faith for Faith truly has been my Gift from God and I thank Him for it every day. I’d love to share my Gift with you if you’d like. But you’ll have to pray to God for at least the willingness to believe what is right and then act on the inspiration that will come via the Holy Spirit in the form of Grace.
Hope I answered your question.